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\ No newline at end of file +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[778],{76112:e=>{e.exports=JSON.parse('{"metadata":{"permalink":"/community/blog/page/2","page":2,"postsPerPage":8,"totalPages":14,"totalCount":107,"previousPage":"/community/blog","nextPage":"/community/blog/page/3","blogDescription":"Blog","blogTitle":"Blog"}}')}}]); \ No newline at end of file diff --git a/assets/js/320d88c4.c4755d5b.js b/assets/js/320d88c4.0d52a8b8.js similarity index 99% rename from assets/js/320d88c4.c4755d5b.js rename to assets/js/320d88c4.0d52a8b8.js index 4e134425..a190f953 100644 --- a/assets/js/320d88c4.c4755d5b.js +++ b/assets/js/320d88c4.0d52a8b8.js @@ -1 +1 @@ -"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[3910],{39748:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>l,contentTitle:()=>s,default:()=>u,frontMatter:()=>i,metadata:()=>o,toc:()=>c});var r=t(85893),a=t(11151);const i={id:"compose",title:"Compose and UIs",sidebar_position:3},s=void 0,o={id:"learn/quickstart/compose",title:"Compose and UIs",description:"Arrow provides several features which are very interesting when developing",source:"@site/content/docs/learn/quickstart/compose.md",sourceDirName:"learn/quickstart",slug:"/learn/quickstart/compose",permalink:"/learn/quickstart/compose",draft:!1,unlisted:!1,editUrl:"https://github.com/arrow-kt/arrow-website/edit/main/content/docs/learn/quickstart/compose.md",tags:[],version:"current",sidebarPosition:3,frontMatter:{id:"compose",title:"Compose and UIs",sidebar_position:3},sidebar:"learnSidebar",previous:{title:"Serialization",permalink:"/learn/quickstart/serialization"},next:{title:"Migration to Arrow 1.2.0",permalink:"/learn/quickstart/migration"}},l={},c=[{value:"Compose is functional",id:"compose-is-functional",level:2},{value:"Simpler effectful code",id:"simpler-effectful-code",level:2},{value:"Built-in error types",id:"built-in-error-types",level:2},{value:"Updating the model",id:"updating-the-model",level:2}];function d(e){const n={a:"a",admonition:"admonition",code:"code",em:"em",h2:"h2",li:"li",p:"p",pre:"pre",ul:"ul",...(0,a.a)(),...e.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(n.p,{children:"Arrow provides several features which are very interesting when developing\ninteractive applications, especially in combination with libraries with a\nsimilar functional flavor, such as Compose."}),"\n",(0,r.jsx)(n.admonition,{title:"Example projects",type:"info",children:(0,r.jsxs)(n.p,{children:["Projects using Compose and Arrow can be found in the\n",(0,r.jsx)(n.a,{href:"../../design/projects/",children:"corresponding section"}),"."]})}),"\n",(0,r.jsx)(n.admonition,{title:"Multiplatform-ready",type:"note",children:(0,r.jsxs)(n.p,{children:["All the libraries under the Arrow umbrella are\n",(0,r.jsx)(n.a,{href:"https://kotlinlang.org/docs/multiplatform.html",children:"Multiplatform"}),"-ready.\nThis means you can use them in your Android applications using\n",(0,r.jsx)(n.a,{href:"https://developer.android.com/jetpack/compose",children:"Jetpack Compose"}),",\nand in Desktop, iOS, or Web alongside\n",(0,r.jsx)(n.a,{href:"https://www.jetbrains.com/lp/compose-multiplatform/",children:"Compose Multiplaftorm"}),"."]})}),"\n",(0,r.jsx)(n.h2,{id:"compose-is-functional",children:"Compose is functional"}),"\n",(0,r.jsxs)(n.p,{children:["As opposed to other frameworks where stateful components are the norm, the\n",(0,r.jsx)(n.a,{href:"https://developer.android.com/jetpack/compose/architecture",children:"architecture"}),"\npromoted by Compose brings many concepts traditionally associated with a\nmore functional approach. For example, the UI is defined as a ",(0,r.jsx)(n.em,{children:"function"}),"\ntaking as arguments the ",(0,r.jsx)(n.em,{children:"values"})," from the current state. Updating the state\nis also explicitly marked, and often separated in a ",(0,r.jsx)(n.code,{children:"ViewModel"}),"."]}),"\n",(0,r.jsxs)(n.p,{children:["As a consequence, Arrow and Compose make great dancing partners. Below we\ndiscuss a few feature which we think are an immediately gain for Android\n(and with Compose Multiplatform, other UI) developers. In the same vein, our\n",(0,r.jsx)(n.a,{href:"../../design/",children:"design"})," section readily applies to projects using Compose."]}),"\n",(0,r.jsx)(n.h2,{id:"simpler-effectful-code",children:"Simpler effectful code"}),"\n",(0,r.jsxs)(n.p,{children:["Most applications don't live in a vacuum, they need to access other services\nor data sources. In those cases we write ",(0,r.jsx)(n.em,{children:"effectful"})," code, where ",(0,r.jsx)(n.code,{children:"suspend"})," and\ncoroutines become relevant."]}),"\n",(0,r.jsxs)(n.p,{children:["Arrow Fx introduces\n",(0,r.jsx)(n.a,{href:"../../coroutines/parallel/",children:"high-level concurrency"})," as a way to simplify code\nwhere different actions must happen concurrently, ensuring that all rules\nof Structured Concurrency are followed, but without the hassle."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-kotlin",children:"class UserSettingsModel: ViewModel() {\n private val _userData = mutableStateOf(null)\n val userData: State get() = _userData\n\n suspend fun loadUserData(userId: UserId) =\n parZip(\n { downloadAvatar(userId) },\n { UserRepository.getById(userId) }\n ) { avatarFile, user ->\n // this code is called once both finish\n _userData.value = UserData(\n id = userId,\n details = user,\n avatar = Avatar(avatarFile)\n )\n }\n}\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Anything outside your own application is the wilderness: connections are\ndown, services are unavailable. Arrow's ",(0,r.jsx)(n.a,{href:"../../resilience/",children:"resilience"}),"\nmodule provides several ready-to-use patterns to better handle those situations,\nincluding ",(0,r.jsx)(n.a,{href:"../../resilience/retry-and-repeat/",children:"retry policies"}),"\nand ",(0,r.jsx)(n.a,{href:"../../resilience/circuitbreaker/",children:"circuit breakers"}),"."]}),"\n",(0,r.jsx)(n.h2,{id:"built-in-error-types",children:"Built-in error types"}),"\n",(0,r.jsxs)(n.p,{children:["One key part of every application is how the domain is modelled.\nArrow emphasizes using ",(0,r.jsx)(n.a,{href:"../../design/domain-modeling/",children:"immutable data"}),".\nIn particular, sealed hierarchies take the important role of describing the\ndifferent states."]}),"\n",(0,r.jsxs)(n.p,{children:['Although every application is unique, a common scenario in interactive\napplications involve having a "success state" and an "error state".\nFor example, correctly loading the user data, or encountering a problem\nwith connection or authentication. Instead of rolling your own types,\nArrow (and our sibling library ',(0,r.jsx)(n.a,{href:"https://cashapp.github.io/quiver/",children:"Quiver"}),")\nprovide out-of-the-box solutions:"]}),"\n",(0,r.jsxs)(n.ul,{children:["\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"../../typed-errors/either-and-ior/",children:(0,r.jsx)(n.code,{children:"Either"})})," describes a model\nin which the application has either completely succeeded, or\nsome amount of errors have occured. Validation is a prime example,\nsince we usually require for all fields to be valid before\nmoving forward with the data."]}),"\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"../../typed-errors/either-and-ior/",children:(0,r.jsx)(n.code,{children:"Ior"})})," introduces a third\noption, namely succeeding but still with some problems along the way.\nThis type is useful to model domains where we can work with some\nerroneous or missing information."]}),"\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"https://cashapp.github.io/quiver/-quiver%20-library/app.cash.quiver/-outcome/index.html",children:(0,r.jsx)(n.code,{children:"Outcome"})}),"\nmodels success, failure, and absence. The latter case is useful\nwhen the application may be in ",(0,r.jsx)(n.em,{children:"loading"})," state: still no problems,\nbut no data ready either."]}),"\n"]}),"\n",(0,r.jsxs)(n.p,{children:["Given the commonalities, Arrow provides a ",(0,r.jsx)(n.a,{href:"../../typed-errors/working-with-typed-errors/",children:"uniform API"}),"\nto work with values of those types."]}),"\n",(0,r.jsx)(n.h2,{id:"updating-the-model",children:"Updating the model"}),"\n",(0,r.jsxs)(n.p,{children:["One potential drawback of using\n",(0,r.jsx)(n.a,{href:"../../design/domain-modeling/",children:"immutable data to model your state"}),"\nis that updating it can become quite tiresome, because Kotlin provides\nno dedicated feature other than ",(0,r.jsx)(n.code,{children:"copy"})," for this task."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-kotlin",children:"class UserSettingsModel: ViewModel() {\n private val _userData = mutableStateOf(null)\n val userData: State get() = _userData\n\n fun updateName(\n newFirstName: String, newLastName: String\n ) {\n _userData.value = _userData.value.copy(\n details = _userData.value.details.copy(\n name = _userData.value.details.name.copy(\n firstName = newFirstName, lastName = newLastName\n )\n )\n )\n }\n}\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Arrow Optics addresses these drawbacks, providing\n",(0,r.jsxs)(n.a,{href:"../../immutable-data/intro/",children:["tools for manipulating and transforming ",(0,r.jsx)(n.em,{children:"immutable"})," data"]}),".\nThe code above can be rewritten without boring repetition using\nthe ",(0,r.jsxs)(n.a,{href:"../../immutable-data/lens/#more-powerful-copy",children:["dedicated ",(0,r.jsx)(n.code,{children:"copy"})," for ",(0,r.jsx)(n.code,{children:"MutableState"})]}),"."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-kotlin",children:"class UserSettingsModel: ViewModel() {\n private val _userData = mutableStateOf(null)\n val userData: State get() = _userData\n\n fun updateName(\n newFirstName: String, newLastName: String\n ) {\n _userData.updateCopy {\n inside(UserData.details.name) {\n Name.firstName set newFirstName\n Name.lastName set newLastName\n }\n }\n }\n}\n"})})]})}function u(e={}){const{wrapper:n}={...(0,a.a)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(d,{...e})}):d(e)}},11151:(e,n,t)=>{t.d(n,{Z:()=>o,a:()=>s});var r=t(67294);const a={},i=r.createContext(a);function s(e){const n=r.useContext(i);return r.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function o(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(a):e.components||a:s(e.components),r.createElement(i.Provider,{value:n},e.children)}}}]); \ No newline at end of file +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[3910],{39748:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>l,contentTitle:()=>s,default:()=>u,frontMatter:()=>i,metadata:()=>o,toc:()=>c});var r=t(85893),a=t(11151);const i={id:"compose",title:"Compose and UIs",sidebar_position:3},s=void 0,o={id:"learn/quickstart/compose",title:"Compose and UIs",description:"Arrow provides several features which are very interesting when developing",source:"@site/content/docs/learn/quickstart/compose.md",sourceDirName:"learn/quickstart",slug:"/learn/quickstart/compose",permalink:"/learn/quickstart/compose",draft:!1,unlisted:!1,editUrl:"https://github.com/arrow-kt/arrow-website/edit/main/content/docs/learn/quickstart/compose.md",tags:[],version:"current",sidebarPosition:3,frontMatter:{id:"compose",title:"Compose and UIs",sidebar_position:3},sidebar:"learnSidebar",previous:{title:"Serialization",permalink:"/learn/quickstart/serialization"},next:{title:"Migration to Arrow 1.2.0",permalink:"/learn/quickstart/migration"}},l={},c=[{value:"Compose is functional",id:"compose-is-functional",level:2},{value:"Simpler effectful code",id:"simpler-effectful-code",level:2},{value:"Built-in error types",id:"built-in-error-types",level:2},{value:"Updating the model",id:"updating-the-model",level:2}];function d(e){const n={a:"a",admonition:"admonition",code:"code",em:"em",h2:"h2",li:"li",p:"p",pre:"pre",ul:"ul",...(0,a.a)(),...e.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(n.p,{children:"Arrow provides several features which are very interesting when developing\ninteractive applications, especially in combination with libraries with a\nsimilar functional flavor, such as Compose."}),"\n",(0,r.jsx)(n.admonition,{title:"Example projects",type:"info",children:(0,r.jsxs)(n.p,{children:["Projects using Compose and Arrow can be found in the\n",(0,r.jsx)(n.a,{href:"../../design/projects/",children:"corresponding section"}),"."]})}),"\n",(0,r.jsx)(n.admonition,{title:"Multiplatform-ready",type:"note",children:(0,r.jsxs)(n.p,{children:["All the libraries under the Arrow umbrella are\n",(0,r.jsx)(n.a,{href:"https://kotlinlang.org/docs/multiplatform.html",children:"Multiplatform"}),"-ready.\nThis means you can use them in your Android applications using\n",(0,r.jsx)(n.a,{href:"https://developer.android.com/jetpack/compose",children:"Jetpack Compose"}),",\nand in Desktop, iOS, or Web alongside\n",(0,r.jsx)(n.a,{href:"https://www.jetbrains.com/lp/compose-multiplatform/",children:"Compose Multiplatform"}),"."]})}),"\n",(0,r.jsx)(n.h2,{id:"compose-is-functional",children:"Compose is functional"}),"\n",(0,r.jsxs)(n.p,{children:["As opposed to other frameworks where stateful components are the norm, the\n",(0,r.jsx)(n.a,{href:"https://developer.android.com/jetpack/compose/architecture",children:"architecture"}),"\npromoted by Compose brings many concepts traditionally associated with a\nmore functional approach. For example, the UI is defined as a ",(0,r.jsx)(n.em,{children:"function"}),"\ntaking as arguments the ",(0,r.jsx)(n.em,{children:"values"})," from the current state. Updating the state\nis also explicitly marked, and often separated in a ",(0,r.jsx)(n.code,{children:"ViewModel"}),"."]}),"\n",(0,r.jsxs)(n.p,{children:["As a consequence, Arrow and Compose make great dancing partners. Below we\ndiscuss a few feature which we think are an immediately gain for Android\n(and with Compose Multiplatform, other UI) developers. In the same vein, our\n",(0,r.jsx)(n.a,{href:"../../design/",children:"design"})," section readily applies to projects using Compose."]}),"\n",(0,r.jsx)(n.h2,{id:"simpler-effectful-code",children:"Simpler effectful code"}),"\n",(0,r.jsxs)(n.p,{children:["Most applications don't live in a vacuum, they need to access other services\nor data sources. In those cases we write ",(0,r.jsx)(n.em,{children:"effectful"})," code, where ",(0,r.jsx)(n.code,{children:"suspend"})," and\ncoroutines become relevant."]}),"\n",(0,r.jsxs)(n.p,{children:["Arrow Fx introduces\n",(0,r.jsx)(n.a,{href:"../../coroutines/parallel/",children:"high-level concurrency"})," as a way to simplify code\nwhere different actions must happen concurrently, ensuring that all rules\nof Structured Concurrency are followed, but without the hassle."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-kotlin",children:"class UserSettingsModel: ViewModel() {\n private val _userData = mutableStateOf(null)\n val userData: State get() = _userData\n\n suspend fun loadUserData(userId: UserId) =\n parZip(\n { downloadAvatar(userId) },\n { UserRepository.getById(userId) }\n ) { avatarFile, user ->\n // this code is called once both finish\n _userData.value = UserData(\n id = userId,\n details = user,\n avatar = Avatar(avatarFile)\n )\n }\n}\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Anything outside your own application is the wilderness: connections are\ndown, services are unavailable. Arrow's ",(0,r.jsx)(n.a,{href:"../../resilience/",children:"resilience"}),"\nmodule provides several ready-to-use patterns to better handle those situations,\nincluding ",(0,r.jsx)(n.a,{href:"../../resilience/retry-and-repeat/",children:"retry policies"}),"\nand ",(0,r.jsx)(n.a,{href:"../../resilience/circuitbreaker/",children:"circuit breakers"}),"."]}),"\n",(0,r.jsx)(n.h2,{id:"built-in-error-types",children:"Built-in error types"}),"\n",(0,r.jsxs)(n.p,{children:["One key part of every application is how the domain is modelled.\nArrow emphasizes using ",(0,r.jsx)(n.a,{href:"../../design/domain-modeling/",children:"immutable data"}),".\nIn particular, sealed hierarchies take the important role of describing the\ndifferent states."]}),"\n",(0,r.jsxs)(n.p,{children:['Although every application is unique, a common scenario in interactive\napplications involve having a "success state" and an "error state".\nFor example, correctly loading the user data, or encountering a problem\nwith connection or authentication. Instead of rolling your own types,\nArrow (and our sibling library ',(0,r.jsx)(n.a,{href:"https://cashapp.github.io/quiver/",children:"Quiver"}),")\nprovide out-of-the-box solutions:"]}),"\n",(0,r.jsxs)(n.ul,{children:["\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"../../typed-errors/either-and-ior/",children:(0,r.jsx)(n.code,{children:"Either"})})," describes a model\nin which the application has either completely succeeded, or\nsome amount of errors have occured. Validation is a prime example,\nsince we usually require for all fields to be valid before\nmoving forward with the data."]}),"\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"../../typed-errors/either-and-ior/",children:(0,r.jsx)(n.code,{children:"Ior"})})," introduces a third\noption, namely succeeding but still with some problems along the way.\nThis type is useful to model domains where we can work with some\nerroneous or missing information."]}),"\n",(0,r.jsxs)(n.li,{children:[(0,r.jsx)(n.a,{href:"https://cashapp.github.io/quiver/-quiver%20-library/app.cash.quiver/-outcome/index.html",children:(0,r.jsx)(n.code,{children:"Outcome"})}),"\nmodels success, failure, and absence. The latter case is useful\nwhen the application may be in ",(0,r.jsx)(n.em,{children:"loading"})," state: still no problems,\nbut no data ready either."]}),"\n"]}),"\n",(0,r.jsxs)(n.p,{children:["Given the commonalities, Arrow provides a ",(0,r.jsx)(n.a,{href:"../../typed-errors/working-with-typed-errors/",children:"uniform API"}),"\nto work with values of those types."]}),"\n",(0,r.jsx)(n.h2,{id:"updating-the-model",children:"Updating the model"}),"\n",(0,r.jsxs)(n.p,{children:["One potential drawback of using\n",(0,r.jsx)(n.a,{href:"../../design/domain-modeling/",children:"immutable data to model your state"}),"\nis that updating it can become quite tiresome, because Kotlin provides\nno dedicated feature other than ",(0,r.jsx)(n.code,{children:"copy"})," for this task."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-kotlin",children:"class UserSettingsModel: ViewModel() {\n private val _userData = mutableStateOf(null)\n val userData: State get() = _userData\n\n fun updateName(\n newFirstName: String, newLastName: String\n ) {\n _userData.value = _userData.value.copy(\n details = _userData.value.details.copy(\n name = _userData.value.details.name.copy(\n firstName = newFirstName, lastName = newLastName\n )\n )\n )\n }\n}\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Arrow Optics addresses these drawbacks, providing\n",(0,r.jsxs)(n.a,{href:"../../immutable-data/intro/",children:["tools for manipulating and transforming ",(0,r.jsx)(n.em,{children:"immutable"})," data"]}),".\nThe code above can be rewritten without boring repetition using\nthe ",(0,r.jsxs)(n.a,{href:"../../immutable-data/lens/#more-powerful-copy",children:["dedicated ",(0,r.jsx)(n.code,{children:"copy"})," for ",(0,r.jsx)(n.code,{children:"MutableState"})]}),"."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-kotlin",children:"class UserSettingsModel: ViewModel() {\n private val _userData = mutableStateOf(null)\n val userData: State get() = _userData\n\n fun updateName(\n newFirstName: String, newLastName: String\n ) {\n _userData.updateCopy {\n inside(UserData.details.name) {\n Name.firstName set newFirstName\n Name.lastName set newLastName\n }\n }\n }\n}\n"})})]})}function u(e={}){const{wrapper:n}={...(0,a.a)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(d,{...e})}):d(e)}},11151:(e,n,t)=>{t.d(n,{Z:()=>o,a:()=>s});var r=t(67294);const a={},i=r.createContext(a);function s(e){const n=r.useContext(i);return r.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function o(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(a):e.components||a:s(e.components),r.createElement(i.Provider,{value:n},e.children)}}}]); 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\ No newline at end of file diff --git a/assets/js/6d31d159.0fb7de4a.js b/assets/js/6d31d159.0fb7de4a.js new file mode 100644 index 00000000..349ac2cf --- /dev/null +++ b/assets/js/6d31d159.0fb7de4a.js @@ -0,0 +1 @@ +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[7453],{3646:(e,t,n)=>{n.r(t),n.d(t,{assets:()=>l,contentTitle:()=>i,default:()=>h,frontMatter:()=>o,metadata:()=>s,toc:()=>c});var a=n(85893),r=n(11151);const o={title:"Arrow Open Space @ Lambda World",category:"articles",tags:["articles","community"],image:"https://pub-c7459893ae854bbdb5ad00855f44c0c8.r2.dev/LandingPage_Lambda/Lambda_Logo_Blue.svg"},i="Arrow Open Space @ Lambda World",s={permalink:"/community/blog/2024/10/03/arrow-open-space",editUrl:"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2024-10-03-arrow-open-space.md",source:"@site/content/blog/2024-10-03-arrow-open-space.md",title:"Arrow Open Space @ Lambda World",description:"The first Arrow & Fuctional Kotlin Open Space is taking place as part of Lambda World! 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The perfect setup to share some knowledge about Arrow and Functional Kotlin! Our goal with the Unconference is to bring together people who can talk about something and people who want to learn about something."}),"\n",(0,a.jsxs)(t.p,{children:[(0,a.jsx)(t.em,{children:"How does it work?"})," Please talk to one of the people in charge so they can change the spreadsheet."]}),"\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsxs)(t.li,{children:["If you want to learn about a topic...","\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsxs)(t.li,{children:["If the topic is not yet in the spreadsheet, add it in the first column with the ",(0,a.jsx)(t.em,{children:"Requested"})," status."]}),"\n",(0,a.jsx)(t.li,{children:"If the topic is in the spreadsheet, contact the potential speaker."}),"\n"]}),"\n"]}),"\n",(0,a.jsxs)(t.li,{children:["If you want to talk about a topic...","\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsx)(t.li,{children:"If it is already in the spreadsheet, shout it out loud and let the talk begin!"}),"\n",(0,a.jsxs)(t.li,{children:["If not, add your topic and name with the ",(0,a.jsx)(t.em,{children:"Waiting"})," status, and wait for somebody to request it."]}),"\n"]}),"\n"]}),"\n",(0,a.jsxs)(t.li,{children:["Once the talk begins, change it status to ",(0,a.jsx)(t.em,{children:"In progress"}),", and once it is finished, move it to ",(0,a.jsx)(t.em,{children:"Done"}),".","\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsx)(t.li,{children:"It would be great if any material or code would be shared with the organizers, so we can later add it to this page."}),"\n"]}),"\n"]}),"\n"]}),"\n",(0,a.jsx)("iframe",{width:"100%",height:"300px",src:"https://docs.google.com/spreadsheets/d/15H8lXScJkX4aao02VqLcDqXwASlo-XrCvmlPl9qgN_Y/pubhtml?range=A1:C20&gid=0&single=true&widget=false&headers=false"}),"\n",(0,a.jsx)(t.h2,{id:"build-together",children:"Build together"}),"\n",(0,a.jsx)(t.p,{children:"The goal of the Open Space is to learn. Many of us around are happy to help, so feel free to work in any project you want, and explore ways to use more functional features in your Kotlin. Once again, don't be shy to ask :)"}),"\n",(0,a.jsx)(t.p,{children:"If you are not sure about where to start, we have prepared a few tutorials and projects for you."}),"\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsxs)(t.li,{children:[(0,a.jsx)(t.a,{href:"https://serranofp.com/poke-fun/",children:"Pok\xe9-Fun with Kotlin and Arrow"}),": exercises about different parts of Arrow, and how you can apply them to a Compose Multiplatform project."]}),"\n",(0,a.jsxs)(t.li,{children:[(0,a.jsx)(t.a,{href:"https://arrow-kt.io/learn/design/projects/",children:"Example projects"})," from the Arrow documentation"]}),"\n"]})]})}function h(e={}){const{wrapper:t}={...(0,r.a)(),...e.components};return t?(0,a.jsx)(t,{...e,children:(0,a.jsx)(d,{...e})}):d(e)}},11151:(e,t,n)=>{n.d(t,{Z:()=>s,a:()=>i});var a=n(67294);const r={},o=a.createContext(r);function i(e){const t=a.useContext(o);return a.useMemo((function(){return"function"==typeof e?e(t):{...t,...e}}),[t,e])}function s(e){let t;return t=e.disableParentContext?"function"==typeof e.components?e.components(r):e.components||r:i(e.components),a.createElement(o.Provider,{value:t},e.children)}}}]); \ No newline at end of file diff --git a/assets/js/71429cd6.a88bd38c.js b/assets/js/71429cd6.4c9417e5.js similarity index 82% rename from assets/js/71429cd6.a88bd38c.js rename to assets/js/71429cd6.4c9417e5.js index 1e3ced41..aa5b45b3 100644 --- a/assets/js/71429cd6.a88bd38c.js +++ b/assets/js/71429cd6.4c9417e5.js @@ -1 +1 @@ -"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[7926],{7225:e=>{e.exports=JSON.parse('{"metadata":{"permalink":"/community/blog/page/5","page":5,"postsPerPage":8,"totalPages":14,"totalCount":106,"previousPage":"/community/blog/page/4","nextPage":"/community/blog/page/6","blogDescription":"Blog","blogTitle":"Blog"}}')}}]); \ No newline at end of file +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[7926],{7225:e=>{e.exports=JSON.parse('{"metadata":{"permalink":"/community/blog/page/5","page":5,"postsPerPage":8,"totalPages":14,"totalCount":107,"previousPage":"/community/blog/page/4","nextPage":"/community/blog/page/6","blogDescription":"Blog","blogTitle":"Blog"}}')}}]); \ No newline at end of file diff --git a/assets/js/715bbc75.52d30aeb.js b/assets/js/715bbc75.52d30aeb.js deleted file mode 100644 index 5996d862..00000000 --- a/assets/js/715bbc75.52d30aeb.js +++ /dev/null @@ -1 +0,0 @@ -"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[3637],{97924:(e,n,r)=>{r.r(n),r.d(n,{assets:()=>a,contentTitle:()=>s,default:()=>h,frontMatter:()=>o,metadata:()=>l,toc:()=>c});var t=r(85893),i=r(11151);const o={title:"Arrow plug-in for IntelliJ 0.1 is here!",category:"articles",tags:["intellij","articles"]},s="Arrow plug-in for IntelliJ 0.1 is here!",l={permalink:"/community/blog/2024/06/01/intellij-plugin",editUrl:"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2024-06-01-intellij-plugin.md",source:"@site/content/blog/2024-06-01-intellij-plugin.md",title:"Arrow plug-in for IntelliJ 0.1 is here!",description:"One of the main goals of the Arrow project is to produce libraries",date:"2024-06-01T00:00:00.000Z",tags:[{label:"intellij",permalink:"/community/blog/tags/intellij"},{label:"articles",permalink:"/community/blog/tags/articles"}],readingTime:1.41,hasTruncateMarker:!1,authors:[],frontMatter:{title:"Arrow plug-in for IntelliJ 0.1 is here!",category:"articles",tags:["intellij","articles"]},unlisted:!1,nextItem:{title:"Arrow 1.2.3 release",permalink:"/community/blog/2024/02/28/arrow-1-2-3"}},a={authorsImageUrls:[]},c=[];function d(e){const n={a:"a",code:"code",p:"p",...(0,i.a)(),...e.components};return(0,t.jsxs)(t.Fragment,{children:[(0,t.jsxs)(n.p,{children:["One of the main goals of the Arrow project is to produce libraries\nthat follow well-known Kotlin idioms, and we strive to make them\nas discoverable as possible. Nevertheless, the surface of some\ncomponents, like ",(0,t.jsx)(n.a,{href:"/learn/typed-errors/",children:"typed errors"}),",\nis quite large.\nFor that reason, we have been busy in the last weeks preparing\nthe first release of the\n",(0,t.jsx)(n.a,{href:"https://plugins.jetbrains.com/plugin/24550-arrow",children:"Arrow plug-in for IntelliJ-based IDEs"}),"."]}),"\n",(0,t.jsxs)(n.p,{children:["This first version already focuses on three different aspects of\nArrow usage where we found that an additional companion can make\na big difference. The first aspect is the usage of typed errors:\nthe IDE will now suggest missing ",(0,t.jsx)(n.code,{children:".bind()"})," or ",(0,t.jsx)(n.code,{children:".bindAll()"}),",\nmapping of error using ",(0,t.jsx)(n.code,{children:"withError"}),", and promoting idioms like\n",(0,t.jsx)(n.code,{children:"ensure"})," whenever possible."]}),"\n",(0,t.jsxs)(n.p,{children:["The second aspect is warning about wrong usages of Arrow APIs\nwhich cannot be prevented by Kotlin's type system alone. This includes\nescaping of ",(0,t.jsx)(n.code,{children:"Raise"})," contexts -- for example, using ",(0,t.jsx)(n.code,{children:"sequence"})," or\n",(0,t.jsx)(n.code,{children:"flow"})," inside ",(0,t.jsx)(n.code,{children:"either"})," --, using ",(0,t.jsx)(n.code,{children:"Atomic"})," with primitive types\n-- where ",(0,t.jsx)(n.code,{children:"AtomicInt"})," or ",(0,t.jsx)(n.code,{children:"AtomicBoolean"})," should be used instead --,\nor matching on ",(0,t.jsx)(n.code,{children:"Eval"})," instances directly instead of using the\nprovided API -- which can easily lead to broken invariants."]}),"\n",(0,t.jsxs)(n.p,{children:["The third aspect is applying some known recipes which may be hard\nto know upfront. 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Our goal with the Unconference is to bring together people who can talk about something and people who want to learn about something."}),"\n",(0,a.jsxs)(t.p,{children:[(0,a.jsx)(t.em,{children:"How does it work?"})," Please talk to one of the people in charge so they can change the spreadsheet."]}),"\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsxs)(t.li,{children:["If you want to learn about a topic...","\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsxs)(t.li,{children:["If the topic is not yet in the spreadsheet, add it in the first column with the ",(0,a.jsx)(t.em,{children:"Requested"})," status."]}),"\n",(0,a.jsx)(t.li,{children:"If the topic is in the spreadsheet, contact the potential speaker."}),"\n"]}),"\n"]}),"\n",(0,a.jsxs)(t.li,{children:["If you want to talk about a topic...","\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsx)(t.li,{children:"If it is already in the spreadsheet, shout it out loud and let the talk begin!"}),"\n",(0,a.jsxs)(t.li,{children:["If not, add your topic and name with the ",(0,a.jsx)(t.em,{children:"Waiting"})," status, and wait for somebody to request it."]}),"\n"]}),"\n"]}),"\n",(0,a.jsxs)(t.li,{children:["Once the talk begins, change it status to ",(0,a.jsx)(t.em,{children:"In progress"}),", and once it is finished, move it to ",(0,a.jsx)(t.em,{children:"Done"}),".","\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsx)(t.li,{children:"It would be great if any material or code would be shared with the organizers, so we can later add it to this page."}),"\n"]}),"\n"]}),"\n"]}),"\n",(0,a.jsx)("iframe",{width:"100%",height:"300px",src:"https://docs.google.com/spreadsheets/d/15H8lXScJkX4aao02VqLcDqXwASlo-XrCvmlPl9qgN_Y/pubhtml?range=A1:C20&gid=0&single=true&widget=false&headers=false"}),"\n",(0,a.jsx)(t.h2,{id:"build-together",children:"Build together"}),"\n",(0,a.jsx)(t.p,{children:"The goal of the Open Space is to learn. 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Once again, don't be shy to ask :)"}),"\n",(0,a.jsx)(t.p,{children:"If you are not sure about where to start, we have prepared a few tutorials and projects for you."}),"\n",(0,a.jsxs)(t.ul,{children:["\n",(0,a.jsxs)(t.li,{children:[(0,a.jsx)(t.a,{href:"https://serranofp.com/poke-fun/",children:"Pok\xe9-Fun with Kotlin and Arrow"}),": exercises about different parts of Arrow, and how you can apply them to a Compose Multiplatform project."]}),"\n",(0,a.jsxs)(t.li,{children:[(0,a.jsx)(t.a,{href:"https://arrow-kt.io/learn/design/projects/",children:"Example projects"})," from the Arrow documentation"]}),"\n"]})]})}function h(e={}){const{wrapper:t}={...(0,r.a)(),...e.components};return t?(0,a.jsx)(t,{...e,children:(0,a.jsx)(d,{...e})}):d(e)}},11151:(e,t,n)=>{n.d(t,{Z:()=>s,a:()=>i});var a=n(67294);const r={},o=a.createContext(r);function i(e){const t=a.useContext(o);return a.useMemo((function(){return"function"==typeof e?e(t):{...t,...e}}),[t,e])}function s(e){let t;return t=e.disableParentContext?"function"==typeof e.components?e.components(r):e.components||r:i(e.components),a.createElement(o.Provider,{value:t},e.children)}}}]); 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In particular, we begin with the following domain:"}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Author(val name: String)\ndata class Book(val title: String, val authors: NonEmptyList)\n"})}),"\n",(0,o.jsx)(n.p,{children:"over which we want to implement the following rules:"}),"\n",(0,o.jsxs)(n.ol,{children:["\n",(0,o.jsx)(n.li,{children:"The given title should not be empty,"}),"\n",(0,o.jsxs)(n.li,{children:["The list of authors should ",(0,o.jsx)(n.a,{href:"../../collections-functions/non-empty/",children:"not be empty"}),","]}),"\n",(0,o.jsx)(n.li,{children:"None of the author names should be empty."}),"\n"]}),"\n",(0,o.jsx)(n.p,{children:"We want to accumulate as many error as possible."}),"\n",(0,o.jsx)(n.h2,{id:"smart-constructors",children:"Smart constructors"}),"\n",(0,o.jsxs)(n.p,{children:["The ",(0,o.jsx)(n.code,{children:"Author"})," class exposes its constructor, so we cannot prevent from creating\nwrong values. One could introduce a ",(0,o.jsx)(n.code,{children:"require"})," in the constructor, but we prefer\nto use the typed error mechanism instead. A common pattern in this case is to\n",(0,o.jsx)(n.em,{children:"hide"})," the constructor, and provide a ",(0,o.jsx)(n.em,{children:"smart constructor"})," by adding an ",(0,o.jsx)(n.code,{children:"invoke"}),"\noperator in the companion."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"object EmptyAuthorName\n\ndata class Author private constructor(val name: String) {\n companion object {\n operator fun invoke(name: String): Either = TODO()\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["This way the users of this class still use ",(0,o.jsx)(n.code,{children:'Author("me")'})," to create a new name,\nin the same way one would use a constructor, but actually our ",(0,o.jsx)(n.code,{children:"invoke"})," function\nis called. This allows us to refine the type to an ",(0,o.jsx)(n.code,{children:"Either"}),", which can return\nan error. The implementation uses the ",(0,o.jsx)(n.code,{children:"either"})," computation block, with ",(0,o.jsx)(n.code,{children:"ensure"}),"\ndescribing the constraint #3."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Author private constructor(val name: String) {\n companion object {\n operator fun invoke(name: String): Either = either {\n ensure(name.isNotEmpty()) { EmptyAuthorName }\n Author(name)\n }\n }\n}\n"})}),"\n",(0,o.jsx)(n.h2,{id:"fail-first-vs-accumulation",children:"Fail-first vs. accumulation"}),"\n",(0,o.jsxs)(n.p,{children:["We are going to use a similar approach for ",(0,o.jsx)(n.code,{children:"Book"}),", introducing a smart\nconstructor. We have several different errors, though, which we define as\na hierarchy. Note that ",(0,o.jsx)(n.code,{children:"EmptyAuthor"})," is a different type than before,\nsince we want to accommodate the index of the author."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"sealed interface BookValidationError\nobject EmptyTitle: BookValidationError\nobject NoAuthors: BookValidationError\ndata class EmptyAuthor(val index: Int): BookValidationError\n\ndata class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either = TODO()\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["Let's forget about validating each author for a moment, and just implement the\nemptiness checks for the title and the authors list. Note that in the latter\ncase we perform both the check and the conversion to ",(0,o.jsx)(n.code,{children:"NonEmptyList"})," in a single\ngo using ",(0,o.jsx)(n.code,{children:"ensureNotNull"}),"."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either = either {\n ensure(title.isNotEmpty()) { EmptyTitle }\n ensureNotNull(authors.toNonEmptyListOrNull()) { NoAuthors }\n Book(title, TODO())\n }\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["This code has a problem, though: it only returns ",(0,o.jsx)(n.em,{children:"one"})," error, even if there are\ntwo problems with the data of the ",(0,o.jsx)(n.code,{children:"Book"}),". We would rather use an ",(0,o.jsx)(n.em,{children:"accumulation"}),"\napproach, so we can give back as much information as possible to the user.\nThis requires two changes to the code:"]}),"\n",(0,o.jsxs)(n.ul,{children:["\n",(0,o.jsxs)(n.li,{children:["The result type is now a ",(0,o.jsx)(n.code,{children:"NonEmptyList"})," of problems,"]}),"\n",(0,o.jsxs)(n.li,{children:["We need to wrap the different validations in ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"}),"."]}),"\n"]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either, Book> = either {\n zipOrAccumulate(\n { ensure(title.isNotEmpty()) { EmptyTitle } },\n { ensureNotNull(authors.toNonEmptyListOrNull()) { NoAuthors } }\n ) { _, _ ->\n Book(title, TODO())\n }\n }\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["The result of each of the arguments of ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"})," are available in the\ntrailing lambda. In this case we are not using them: we have the ",(0,o.jsx)(n.code,{children:"title"}),"\nalready available, and for the list of authors we still need to perform the\nconversion from ",(0,o.jsx)(n.code,{children:"String"})," to ",(0,o.jsx)(n.code,{children:"Author"}),"."]}),"\n",(0,o.jsx)(n.admonition,{title:"Arguments to zipOrAccumulate",type:"tip",children:(0,o.jsxs)(n.p,{children:["All but the last argument to ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"})," represent the different\nvalidations we want to run aggregating their output. Those arguments are\noften ",(0,o.jsx)(n.em,{children:"blocks"})," wrapped in ",(0,o.jsx)(n.code,{children:"{"})," curly braces ",(0,o.jsx)(n.code,{children:"}"}),", which is a bit unusual for\nmost Kotliners."]})}),"\n",(0,o.jsx)(n.h2,{id:"validating-a-list",children:"Validating a list"}),"\n",(0,o.jsxs)(n.p,{children:["The next step is turning the given ",(0,o.jsx)(n.code,{children:"authors"}),", which is a list of ",(0,o.jsx)(n.code,{children:"String"}),"s, into\na list of ",(0,o.jsx)(n.code,{children:"Author"}),"s. We need to run the smart constructor, thus, but at the same\ntime we should accumulate any potential problems. Since this is related to\nauthor checks, we'll include this as part of the second validation."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either, Book> = either {\n zipOrAccumulate(\n { ensure(title.isNotEmpty()) { EmptyTitle } },\n { \n val validatedAuthors = mapOrAccumulate(authors.withIndex()) { nameAndIx ->\n Author(nameAndIx.value)\n .recover { _ -> raise(EmptyAuthor(nameAndIx.index)) }\n .bind()\n }\n ensureNotNull(validatedAuthors.toNonEmptyListOrNull()) { NoAuthors }\n }\n ) { _, authorsNel ->\n Book(title, authorsNel)\n }\n }\n }\n}\n"})}),"\n",(0,o.jsx)(n.p,{children:"This additional check is quite complex, so let's unravel it step by step:"}),"\n",(0,o.jsxs)(n.ul,{children:["\n",(0,o.jsxs)(n.li,{children:["We use ",(0,o.jsx)(n.code,{children:"authors.withIndex()"})," to create an iterable containing the values\nin conjunction with the index they live in, this is necessary to create\nthe right ",(0,o.jsx)(n.code,{children:"EmptyAuthor"})," error value."]}),"\n",(0,o.jsxs)(n.li,{children:["With ",(0,o.jsx)(n.code,{children:"mapOrAccumulate"})," we state that we want to perform some validation over\na collection of elements, accumulating each possible error."]}),"\n",(0,o.jsxs)(n.li,{children:["The call to ",(0,o.jsx)(n.code,{children:"Author(it.value)"})," return an ",(0,o.jsx)(n.code,{children:"Either"})," with the wrong error type\n(",(0,o.jsx)(n.code,{children:"EmptyAuthorName"})," instead of ",(0,o.jsx)(n.code,{children:"EmptyAuthor"}),"). To transform this value we\nuse the ",(0,o.jsx)(n.code,{children:"recover"})," extension function."]}),"\n"]}),"\n",(0,o.jsx)(n.admonition,{title:"Recover vs. Map Left",type:"tip",children:(0,o.jsxs)(n.p,{children:["Another possibility would be to use ",(0,o.jsx)(n.code,{children:"mapLeft { EmptyAuthor(it.index) }"}),".\nThe difference between ",(0,o.jsx)(n.code,{children:"recover"})," and ",(0,o.jsx)(n.code,{children:"mapLeft"})," is that the latter only transforms\nthe error value, whereas in the former you can use any typed error computation."]})}),"\n",(0,o.jsxs)(n.ul,{children:["\n",(0,o.jsxs)(n.li,{children:["Finally, we use ",(0,o.jsx)(n.code,{children:".bind()"})," to embed the ",(0,o.jsx)(n.code,{children:"Either"})," into the computation block.\nEssentially, every time you are using a value of type ",(0,o.jsx)(n.code,{children:"Either"})," inside an\n",(0,o.jsx)(n.code,{children:"either"})," (or any other ",(0,o.jsx)(n.code,{children:"Raise"})," block), such a call is required."]}),"\n"]}),"\n",(0,o.jsxs)(n.p,{children:["The result of the mapping is a ",(0,o.jsx)(n.code,{children:"List"}),", that we can now use to create the\nfinal ",(0,o.jsx)(n.code,{children:"Book"}),". This value is available in the last lambda of ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"}),",\nthat we've called ",(0,o.jsx)(n.code,{children:"validatedAuthors"})," in the code above."]}),"\n",(0,o.jsx)(n.h3,{id:"variants-of-map--accumulation",children:"Variants of map + accumulation"}),"\n",(0,o.jsx)(n.p,{children:"In the code above there's one section which can be written in several different\nways, namely the mapping over a list while accumulating any errors raised\nduring the processing of each of the elements."}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{children:"val validatedAuthors = mapOrAccumulate(authors.withIndex()) { nameAndIx ->\n Author(nameAndIx.value)\n .mapLeft { EmptyAuthor(nameAndIx.index) }\n .bind()\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["This first version uses the variant of ",(0,o.jsx)(n.code,{children:"mapOrAccumulate"})," which lives in\n",(0,o.jsx)(n.code,{children:"Raise"})," and takes the collection to work on as first argument. This variant\nprovides ",(0,o.jsx)(n.code,{children:"Raise"})," inside the block (hence the need to call ",(0,o.jsx)(n.code,{children:".bind()"}),"), and\n",(0,o.jsx)(n.code,{children:"raise"}),"s automatically if any error is found."]}),"\n",(0,o.jsxs)(n.p,{children:["Another way to write the code above is creating a list of ",(0,o.jsx)(n.code,{children:"Either"})," using\n",(0,o.jsx)(n.code,{children:"map"}),", and then using ",(0,o.jsx)(n.code,{children:".bindAll()"})," at the very end. This often turns into\nsimpler code when your validations use wrapper types, as we do here, since\nyou don't need to call the intermediate ",(0,o.jsx)(n.code,{children:".bind()"}),"."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{children:"val validatedAuthors = authors.withIndex().map { nameAndIx ->\n Author(nameAndIx.value)\n .mapLeft { EmptyAuthor(nameAndIx.index) }\n}.bindAll()\n"})}),"\n",(0,o.jsx)(n.p,{children:"Any of these approaches are equivalent, given that the function that validates\neach of the elements doesn't perform any side effects."})]})}function d(e={}){const{wrapper:n}={...(0,i.a)(),...e.components};return n?(0,o.jsx)(n,{...e,children:(0,o.jsx)(h,{...e})}):h(e)}},11151:(e,n,t)=>{t.d(n,{Z:()=>s,a:()=>a});var o=t(67294);const i={},r=o.createContext(i);function a(e){const n=o.useContext(r);return o.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function s(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(i):e.components||i:a(e.components),o.createElement(r.Provider,{value:n},e.children)}}}]); \ No newline at end of file +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[8104],{53627:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>l,contentTitle:()=>a,default:()=>d,frontMatter:()=>r,metadata:()=>s,toc:()=>c});var o=t(85893),i=t(11151);const r={id:"validation",title:"Validation",description:"Worked out example of validation.",sidebar_position:4},a="Validation",s={id:"learn/typed-errors/validation",title:"Validation",description:"Worked out example of validation.",source:"@site/content/docs/learn/typed-errors/validation.md",sourceDirName:"learn/typed-errors",slug:"/learn/typed-errors/validation",permalink:"/learn/typed-errors/validation",draft:!1,unlisted:!1,editUrl:"https://github.com/arrow-kt/arrow-website/edit/main/content/docs/learn/typed-errors/validation.md",tags:[],version:"current",sidebarPosition:4,frontMatter:{id:"validation",title:"Validation",description:"Worked out example of validation.",sidebar_position:4},sidebar:"learnSidebar",previous:{title:"Either & Ior",permalink:"/learn/typed-errors/either-and-ior"},next:{title:"From Either to Raise",permalink:"/learn/typed-errors/from-either-to-raise"}},l={},c=[{value:"Smart constructors",id:"smart-constructors",level:2},{value:"Fail-first vs. accumulation",id:"fail-first-vs-accumulation",level:2},{value:"Validating a list",id:"validating-a-list",level:2},{value:"Variants of map + accumulation",id:"variants-of-map--accumulation",level:3}];function h(e){const n={a:"a",admonition:"admonition",code:"code",em:"em",h1:"h1",h2:"h2",h3:"h3",li:"li",ol:"ol",p:"p",pre:"pre",ul:"ul",...(0,i.a)(),...e.components};return(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(n.h1,{id:"validation",children:"Validation"}),"\n",(0,o.jsx)(n.p,{children:"This tutorial shows a concrete example of using typed errors to implement\ndomain validation. In particular, we begin with the following domain:"}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Author(val name: String)\ndata class Book(val title: String, val authors: NonEmptyList)\n"})}),"\n",(0,o.jsx)(n.p,{children:"over which we want to implement the following rules:"}),"\n",(0,o.jsxs)(n.ol,{children:["\n",(0,o.jsx)(n.li,{children:"The given title should not be empty,"}),"\n",(0,o.jsxs)(n.li,{children:["The list of authors should ",(0,o.jsx)(n.a,{href:"../../collections-functions/non-empty/",children:"not be empty"}),","]}),"\n",(0,o.jsx)(n.li,{children:"None of the author names should be empty."}),"\n"]}),"\n",(0,o.jsx)(n.p,{children:"We want to accumulate as many error as possible."}),"\n",(0,o.jsx)(n.h2,{id:"smart-constructors",children:"Smart constructors"}),"\n",(0,o.jsxs)(n.p,{children:["The ",(0,o.jsx)(n.code,{children:"Author"})," class exposes its constructor, so we cannot prevent from creating\nwrong values. One could introduce a ",(0,o.jsx)(n.code,{children:"require"})," in the constructor, but we prefer\nto use the typed error mechanism instead. A common pattern in this case is to\n",(0,o.jsx)(n.em,{children:"hide"})," the constructor, and provide a ",(0,o.jsx)(n.em,{children:"smart constructor"})," by adding an ",(0,o.jsx)(n.code,{children:"invoke"}),"\noperator in the companion."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"object EmptyAuthorName\n\ndata class Author private constructor(val name: String) {\n companion object {\n operator fun invoke(name: String): Either = TODO()\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["This way the users of this class still use ",(0,o.jsx)(n.code,{children:'Author("me")'})," to create a new name,\nin the same way one would use a constructor, but actually our ",(0,o.jsx)(n.code,{children:"invoke"})," function\nis called. This allows us to refine the type to an ",(0,o.jsx)(n.code,{children:"Either"}),", which can return\nan error. The implementation uses the ",(0,o.jsx)(n.code,{children:"either"})," computation block, with ",(0,o.jsx)(n.code,{children:"ensure"}),"\ndescribing the constraint #3."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Author private constructor(val name: String) {\n companion object {\n operator fun invoke(name: String): Either = either {\n ensure(name.isNotEmpty()) { EmptyAuthorName }\n Author(name)\n }\n }\n}\n"})}),"\n",(0,o.jsx)(n.h2,{id:"fail-first-vs-accumulation",children:"Fail-first vs. accumulation"}),"\n",(0,o.jsxs)(n.p,{children:["We are going to use a similar approach for ",(0,o.jsx)(n.code,{children:"Book"}),", introducing a smart\nconstructor. We have several different errors, though, which we define as\na hierarchy. Note that ",(0,o.jsx)(n.code,{children:"EmptyAuthor"})," is a different type than before,\nsince we want to accommodate the index of the author."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"sealed interface BookValidationError\nobject EmptyTitle: BookValidationError\nobject NoAuthors: BookValidationError\ndata class EmptyAuthor(val index: Int): BookValidationError\n\ndata class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either = TODO()\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["Let's forget about validating each author for a moment, and just implement the\nemptiness checks for the title and the authors list. Note that in the latter\ncase we perform both the check and the conversion to ",(0,o.jsx)(n.code,{children:"NonEmptyList"})," in a single\ngo using ",(0,o.jsx)(n.code,{children:"ensureNotNull"}),"."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either = either {\n ensure(title.isNotEmpty()) { EmptyTitle }\n ensureNotNull(authors.toNonEmptyListOrNull()) { NoAuthors }\n Book(title, TODO())\n }\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["This code has a problem, though: it only returns ",(0,o.jsx)(n.em,{children:"one"})," error, even if there are\ntwo problems with the data of the ",(0,o.jsx)(n.code,{children:"Book"}),". We would rather use an ",(0,o.jsx)(n.em,{children:"accumulation"}),"\napproach, so we can give back as much information as possible to the user.\nThis requires two changes to the code:"]}),"\n",(0,o.jsxs)(n.ul,{children:["\n",(0,o.jsxs)(n.li,{children:["The result type is now a ",(0,o.jsx)(n.code,{children:"NonEmptyList"})," of problems,"]}),"\n",(0,o.jsxs)(n.li,{children:["We need to wrap the different validations in ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"}),"."]}),"\n"]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either, Book> = either {\n zipOrAccumulate(\n { ensure(title.isNotEmpty()) { EmptyTitle } },\n { ensureNotNull(authors.toNonEmptyListOrNull()) { NoAuthors } }\n ) { _, _ ->\n Unit\n }\n Book(title, TODO())\n }\n }\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["The result of each of the arguments of ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"})," are available in the\ntrailing lambda. In this case we are not using them: we have the ",(0,o.jsx)(n.code,{children:"title"}),"\nalready available, and for the list of authors we still need to perform the\nconversion from ",(0,o.jsx)(n.code,{children:"String"})," to ",(0,o.jsx)(n.code,{children:"Author"}),"."]}),"\n",(0,o.jsx)(n.admonition,{title:"Arguments to zipOrAccumulate",type:"tip",children:(0,o.jsxs)(n.p,{children:["All but the last argument to ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"})," represent the different\nvalidations we want to run aggregating their output. Those arguments are\noften ",(0,o.jsx)(n.em,{children:"blocks"})," wrapped in ",(0,o.jsx)(n.code,{children:"{"})," curly braces ",(0,o.jsx)(n.code,{children:"}"}),", which is a bit unusual for\nmost Kotliners."]})}),"\n",(0,o.jsx)(n.h2,{id:"validating-a-list",children:"Validating a list"}),"\n",(0,o.jsxs)(n.p,{children:["The next step is turning the given ",(0,o.jsx)(n.code,{children:"authors"}),", which is a list of ",(0,o.jsx)(n.code,{children:"String"}),"s, into\na list of ",(0,o.jsx)(n.code,{children:"Author"}),"s. We need to run the smart constructor, thus, but at the same\ntime we should accumulate any potential problems. Since this is related to\nauthor checks, we'll include this as part of the second validation."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{className:"language-kotlin",children:"data class Book private constructor(\n val title: String, val authors: NonEmptyList\n) {\n companion object {\n operator fun invoke(\n title: String, authors: Iterable\n ): Either, Book> = either {\n zipOrAccumulate(\n { ensure(title.isNotEmpty()) { EmptyTitle } },\n { \n val validatedAuthors = mapOrAccumulate(authors.withIndex()) { nameAndIx ->\n Author(nameAndIx.value)\n .recover { _ -> raise(EmptyAuthor(nameAndIx.index)) }\n .bind()\n }\n ensureNotNull(validatedAuthors.toNonEmptyListOrNull()) { NoAuthors }\n }\n ) { _, authorsNel ->\n Book(title, authorsNel)\n }\n }\n }\n}\n"})}),"\n",(0,o.jsx)(n.p,{children:"This additional check is quite complex, so let's unravel it step by step:"}),"\n",(0,o.jsxs)(n.ul,{children:["\n",(0,o.jsxs)(n.li,{children:["We use ",(0,o.jsx)(n.code,{children:"authors.withIndex()"})," to create an iterable containing the values\nin conjunction with the index they live in, this is necessary to create\nthe right ",(0,o.jsx)(n.code,{children:"EmptyAuthor"})," error value."]}),"\n",(0,o.jsxs)(n.li,{children:["With ",(0,o.jsx)(n.code,{children:"mapOrAccumulate"})," we state that we want to perform some validation over\na collection of elements, accumulating each possible error."]}),"\n",(0,o.jsxs)(n.li,{children:["The call to ",(0,o.jsx)(n.code,{children:"Author(it.value)"})," return an ",(0,o.jsx)(n.code,{children:"Either"})," with the wrong error type\n(",(0,o.jsx)(n.code,{children:"EmptyAuthorName"})," instead of ",(0,o.jsx)(n.code,{children:"EmptyAuthor"}),"). To transform this value we\nuse the ",(0,o.jsx)(n.code,{children:"recover"})," extension function."]}),"\n"]}),"\n",(0,o.jsx)(n.admonition,{title:"Recover vs. Map Left",type:"tip",children:(0,o.jsxs)(n.p,{children:["Another possibility would be to use ",(0,o.jsx)(n.code,{children:"mapLeft { EmptyAuthor(it.index) }"}),".\nThe difference between ",(0,o.jsx)(n.code,{children:"recover"})," and ",(0,o.jsx)(n.code,{children:"mapLeft"})," is that the latter only transforms\nthe error value, whereas in the former you can use any typed error computation."]})}),"\n",(0,o.jsxs)(n.ul,{children:["\n",(0,o.jsxs)(n.li,{children:["Finally, we use ",(0,o.jsx)(n.code,{children:".bind()"})," to embed the ",(0,o.jsx)(n.code,{children:"Either"})," into the computation block.\nEssentially, every time you are using a value of type ",(0,o.jsx)(n.code,{children:"Either"})," inside an\n",(0,o.jsx)(n.code,{children:"either"})," (or any other ",(0,o.jsx)(n.code,{children:"Raise"})," block), such a call is required."]}),"\n"]}),"\n",(0,o.jsxs)(n.p,{children:["The result of the mapping is a ",(0,o.jsx)(n.code,{children:"List"}),", that we can now use to create the\nfinal ",(0,o.jsx)(n.code,{children:"Book"}),". This value is available in the last lambda of ",(0,o.jsx)(n.code,{children:"zipOrAccumulate"}),",\nthat we've called ",(0,o.jsx)(n.code,{children:"validatedAuthors"})," in the code above."]}),"\n",(0,o.jsx)(n.h3,{id:"variants-of-map--accumulation",children:"Variants of map + accumulation"}),"\n",(0,o.jsx)(n.p,{children:"In the code above there's one section which can be written in several different\nways, namely the mapping over a list while accumulating any errors raised\nduring the processing of each of the elements."}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{children:"val validatedAuthors = mapOrAccumulate(authors.withIndex()) { nameAndIx ->\n Author(nameAndIx.value)\n .mapLeft { EmptyAuthor(nameAndIx.index) }\n .bind()\n}\n"})}),"\n",(0,o.jsxs)(n.p,{children:["This first version uses the variant of ",(0,o.jsx)(n.code,{children:"mapOrAccumulate"})," which lives in\n",(0,o.jsx)(n.code,{children:"Raise"})," and takes the collection to work on as first argument. This variant\nprovides ",(0,o.jsx)(n.code,{children:"Raise"})," inside the block (hence the need to call ",(0,o.jsx)(n.code,{children:".bind()"}),"), and\n",(0,o.jsx)(n.code,{children:"raise"}),"s automatically if any error is found."]}),"\n",(0,o.jsxs)(n.p,{children:["Another way to write the code above is creating a list of ",(0,o.jsx)(n.code,{children:"Either"})," using\n",(0,o.jsx)(n.code,{children:"map"}),", and then using ",(0,o.jsx)(n.code,{children:".bindAll()"})," at the very end. This often turns into\nsimpler code when your validations use wrapper types, as we do here, since\nyou don't need to call the intermediate ",(0,o.jsx)(n.code,{children:".bind()"}),"."]}),"\n",(0,o.jsx)(n.pre,{children:(0,o.jsx)(n.code,{children:"val validatedAuthors = authors.withIndex().map { nameAndIx ->\n Author(nameAndIx.value)\n .mapLeft { EmptyAuthor(nameAndIx.index) }\n}.bindAll()\n"})}),"\n",(0,o.jsx)(n.p,{children:"Any of these approaches are equivalent, given that the function that validates\neach of the elements doesn't perform any side effects."})]})}function d(e={}){const{wrapper:n}={...(0,i.a)(),...e.components};return n?(0,o.jsx)(n,{...e,children:(0,o.jsx)(h,{...e})}):h(e)}},11151:(e,n,t)=>{t.d(n,{Z:()=>s,a:()=>a});var o=t(67294);const i={},r=o.createContext(i);function a(e){const n=o.useContext(r);return o.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function s(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(i):e.components||i:a(e.components),o.createElement(r.Provider,{value:n},e.children)}}}]); 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\ No newline at end of file +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[5866],{40740:(e,r,t)=>{t.r(r),t.d(r,{assets:()=>l,contentTitle:()=>a,default:()=>m,frontMatter:()=>c,metadata:()=>d,toc:()=>h});var n=t(85893),o=t(11151),i=t(53438),s=t(97048);const c={title:"Typed Errors"},a="",d={id:"learn/typed-errors/index",title:"Typed Errors",description:"Typed errors refer to a technique from functional programming in which we",source:"@site/content/docs/learn/typed-errors/index.md",sourceDirName:"learn/typed-errors",slug:"/learn/typed-errors/",permalink:"/learn/typed-errors/",draft:!1,unlisted:!1,editUrl:"https://github.com/arrow-kt/arrow-website/edit/main/content/docs/learn/typed-errors/index.md",tags:[],version:"current",frontMatter:{title:"Typed Errors"},sidebar:"learnSidebar",previous:{title:"Migration to Arrow 1.2.0",permalink:"/learn/quickstart/migration"},next:{title:"Working with typed errors",permalink:"/learn/typed-errors/working-with-typed-errors"}},l={},h=[];function p(e){const r={a:"a",code:"code",em:"em",h1:"h1",li:"li",ol:"ol",p:"p",strong:"strong",...(0,o.a)(),...e.components};return(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(r.h1,{id:"",children:(0,n.jsx)("decorated-text",{icon:(0,i.jA)().customProps.icon,title:c.title})}),"\n",(0,n.jsxs)(r.p,{children:[(0,n.jsx)(r.em,{children:"Typed errors"})," refer to a technique from functional programming in which we\nmake ",(0,n.jsx)(r.em,{children:"explicit"})," in the signature (or ",(0,n.jsx)(r.em,{children:"type"}),") the potential errors that may\narise during the execution of a piece of code. 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Nevertheless, the surface of some\\ncomponents, like [typed errors](/learn/typed-errors/),\\nis quite large.\\nFor that reason, we have been busy in the last weeks preparing\\nthe first release of the\\n[Arrow plug-in for IntelliJ-based IDEs](https://plugins.jetbrains.com/plugin/24550-arrow).\\n\\nThis first version already focuses on three different aspects of\\nArrow usage where we found that an additional companion can make\\na big difference. The first aspect is the usage of typed errors:\\nthe IDE will now suggest missing `.bind()` or `.bindAll()`,\\nmapping of error using `withError`, and promoting idioms like\\n`ensure` whenever possible.\\n\\nThe second aspect is warning about wrong usages of Arrow APIs\\nwhich cannot be prevented by Kotlin\'s type system alone. This includes\\nescaping of `Raise` contexts -- for example, using `sequence` or\\n`flow` inside `either` --, using `Atomic` with primitive types \\n-- where `AtomicInt` or `AtomicBoolean` should be used instead --,\\nor matching on `Eval` instances directly instead of using the\\nprovided API -- which can easily lead to broken invariants.\\n\\nThe third aspect is applying some known recipes which may be hard\\nto know upfront. The first release includes a suggestion to add\\nthe corresponding [serializer](/learn/quickstart/serialization/)\\nwhen a type marked as `@Serializable` includes an Arrow Core type.\\nThis is an area which we would like to explore more, helping with\\nthe difficulties raised by the community.\\n\\nThe plug-in lives in a [separate repository](https://github.com/arrow-kt/arrow-intellij).\\nPlease let us know your experience, and don\'t be shy to open issues\\nwith suggestions for more features. They would help not only you\\nbut potentially every user of the Arrow library."},{"id":"/2024/02/28/arrow-1-2-3","metadata":{"permalink":"/community/blog/2024/02/28/arrow-1-2-3","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2024-02-28-arrow-1-2-3.md","source":"@site/content/blog/2024-02-28-arrow-1-2-3.md","title":"Arrow 1.2.3 release","description":"We are happy to announce the availability of version 1.2.3 of the Arrow collection of libraries.","date":"2024-02-28T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":4.65,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 1.2.3 release","category":"articles","tags":["core","articles"]},"unlisted":false,"prevItem":{"title":"Arrow plug-in for IntelliJ 0.1 is here!","permalink":"/community/blog/2024/06/01/intellij-plugin"},"nextItem":{"title":"Arrow releases stable 1.2.0 version","permalink":"/community/blog/2023/07/12/arrow-1-2-0"}},"content":"We are happy to announce the availability of version 1.2.3 of the Arrow collection of libraries.\\nAccording to our plan, this is the last non-bugfix release of the 1.x series.\\nFrom now on, our `main` branch targets Arrow 2.0, which should be the next major release.\\n\\nWe are incredibly thankful to the many people that have contributed to this release,\\nbringing new ideas and quite some code.\\n\\n:::info Please use 1.2.4\\n\\nVersion 1.2.3 of `arrow-core` changed the behavior of `Raise` computations returning\\nfunctions or sequences. This change [restricted some useful usages](https://github.com/arrow-kt/arrow/issues/3391),\\nso the team has decided to roll it back and keep the 1.2.1 behavior.\\n\\n:::\\n\\n## New features\\n\\nA version number like 1.2.3 sounds like a small bugfix release, but this is far from truth in\\nthis case: this release is full of new modules to help you be productive when writing Kotlin.\\n\\n### Improved focus on Compose\\n\\nArrow provides building blocks relevant to many projects using Kotlin.\\nA large part of our community is doing frontend work, and during the latest months,\\nthe team has been trying to understand their needs, in order to make Arrow\\na relevant tool in that space.\\n\\nFrom that journey, we have put together a new documentation page highlighting\\ndifferent ways in which Arrow may be useful in your Compose application.\\nThere is also a new [`arrow-optics-compose` module](/learn/immutable-data/lens/#integration-with-compose)\\nthat includes utilities to work with immutable data inside a `MutableState`\\nor `MutableStateFlow`.\\n\\nWe are eager to hear more use cases or needs where Arrow may help the lives\\nof Kotlin developers. Feel free to drop by the `#arrow` channel in the Kotlin Slack,\\nor open an issue or discussion in our [repository](https://github.com/arrow-kt/arrow).\\n\\n### Non-`suspend` resource management\\n\\n[Resource safety](/learn/coroutines/resource-safety/) in Arrow\\nhas been traditionally tied to the use of coroutines and `suspend` functions.\\nThis is the right choice for Kotlin-first libraries, like Ktor or Koin, but many\\nlibraries still come from a Java background where no such feature exists.\\nBeginning with this version, we provide two \\"variations\\" of resource management:\\n\\n- `Resource`, from the `arrow-fx-coroutines` module, is based on `suspend`\\n and ensures the desired behavior alongside coroutines (including cancellation).\\n- `AutoClose`, from the new `arrow-autoclose` module, provides almost the\\n same API as `Resource`, but without the `suspend` requirement.\\n\\n### Forward compatible `Eval`\\n\\nOne of our goals is to make the transition to 2.0 as smooth as possible.\\nYou can [already migrate](/learn/quickstart/migration/)\\nto the new APIs by using Arrow 1.2.3, and then ensuring that you get no deprecation warnings.\\n\\nDuring this process, we were [made aware](https://github.com/arrow-kt/arrow/issues/3039) that\\nthere was no clear story for the migration of `Eval`. On the other hand, the use cases are very narrow.\\nThe decision was to create a new [`arrow-eval` module](/learn/collections-functions/eval/),\\npresent since this release, and mark the one from `arrow-core` point the new module,\\ninstead of entirely removing this functionality from Arrow.\\n\\n### Collectors\\n\\nThe new [`arrow-collectors` module](/learn/collections-functions/collectors/)\\nallows composing operations over sequences of values\\n(lists, flows, sequences) while ensuring that the sequence is traversed only once.\\nThis property is especially relevant when building the sequence is expensive, or simply\\ncannot be reproduced, like a stream of data from a database or a flow of actions.\\n\\n## Improved features\\n\\nSeveral features in the library have been improved, to ensure that Arrow covers a variety\\nof use cases.\\n\\n### Lenses for sealed classes\\n\\nThis was once of the [older feature requests](https://github.com/arrow-kt/arrow/issues/2829)\\nstill in our issue tracker, which is now closed thanks to a wonderful\\n[contribution](https://github.com/arrow-kt/arrow/pull/3359)!\\n\\nFrom now on, the Optics KSP plug-in can generate\\n[lenses for sealed hierarchies](/learn/immutable-data/lens/#sealed-class-hierarchies),\\ngiven that the field lives in the common parent. For example, the following code\\n\\n```kotlin\\n@optics sealed interface User {\\n val name: String\\n\\n data class Person(override val name: String, val age: Int): User\\n data class Company(override val name: String, val vat: VATNumber): User\\n}\\n```\\n\\ngenerates from this version on both prisms for each choice, and a lens for `name`.\\n\\n### Higher-arity functions\\n\\nWe have traditionally been reluctant to add variations of `zip` with more than\\n10 parameters, because we felt that the narrow use cases did not balance out\\nthe increase in binary size. Since this release Arrow provides those functions\\nin a new `arrow-core-high-arity` module.\\n\\n### More accumulating functions for `Raise`\\n\\n[Typed errors](/learn/typed-errors/working-with-typed-errors/)\\nprovide two essential ways to [accumulate errors](/learn/typed-errors/working-with-typed-errors/#accumulating-errors): `zipOrAccumulate` and `mapOrAccumulate`. Those correspond\\nto accumulating over a fixed number of computations of different types, or\\naccumulating over an unknown quantity of computations with the same type.\\n\\nThe `mapOrAccumulate` function _always_ returns a new list. In some cases, you\\ndon\'t really care about this result, just about the iteration behavior.\\nThis is similar to the different between `map` and `forEach` in the standard\\nlibrary. From there Arrow takes the name of the new function: `forEachAccumulating`.\\n\\nOne potential use case is performing validation over elements of a list,\\nbut keeping the values intact.\\n\\n```kotlin\\npeople.forEachAccumulating { person ->\\n ensure(person.age >= 0) { InvalidAge(person.name) }\\n}\\n```\\n\\n### Better memoization\\n\\n[`MemoizedDeepRecursiveFunction`](/learn/collections-functions/recursive/#memoized-recursive-functions)\\nis a powerful tool to express recursive algorithms without worries over stack overflow or recomputation.\\nHowever, there was a lack of control over how memoized values were stored or evicted, which made the\\ntype less useful than intended.\\n\\nFrom this release on, there are new overloads to support custom memoization policies.\\nFurthermore, the new [`arrow-cache4k` module](/learn/collections-functions/recursive/#memoization-takes-memory)\\nprovides integration with the excellent\\n[cache4k](https://github.com/ReactiveCircus/cache4k) library.\\n\\n## More integrations\\n\\nAlthough not part of this release, we would like to highlight that\\n[Akkurate](https://akkurate.dev), which provides a wonderful DSL for validation over data,\\nhas released an [integration module for Arrow](https://akkurate.dev/docs/arrow-integration.html).\\nThis adds to the [rest of integrations](/learn/integrations/)\\nand shows the collaborative spirit of the Kotlin community."},{"id":"/2023/07/12/arrow-1-2-0","metadata":{"permalink":"/community/blog/2023/07/12/arrow-1-2-0","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-07-12-arrow-1-2-0.md","source":"@site/content/blog/2023-07-12-arrow-1-2-0.md","title":"Arrow releases stable 1.2.0 version","description":"We\'re excited to announce the stable Arrow 1.2.0 version. To briefly summarize, this release:","date":"2023-07-12T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.32,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow releases stable 1.2.0 version","image":"https://xebia.com/wp-content/uploads/2023/04/arrow-release-ftr.jpg","category":"articles","tags":["core","articles"],"link":"https://xebia.com/blog/a-new-module-for-typed-errors-in-arrow-1-2-0/"},"unlisted":false,"prevItem":{"title":"Arrow 1.2.3 release","permalink":"/community/blog/2024/02/28/arrow-1-2-3"},"nextItem":{"title":"Arrow 2.0\'s Trajectory - Video","permalink":"/community/blog/2023/05/04/arrow-trajectory-kotlinconf"}},"content":"We\'re excited to announce the stable Arrow 1.2.0 version. To briefly summarize, this release:\\n\\n- Improves the API for [typed errors](http://arrow-kt.io/learn/typed-errors/working-with-typed-errors/),\\n including [`withError`](https://apidocs.arrow-kt.io/arrow-core/arrow.core.raise/with-error.html)\\n and [`merge`](https://apidocs.arrow-kt.io/arrow-core/arrow.core.raise/merge.html).\\n- Adds [`NonEmptyCollection`](https://apidocs.arrow-kt.io/arrow-core/arrow.core/-non-empty-collection/index.html)\\n as common parent of [`NonEmptyList`](https://apidocs.arrow-kt.io/arrow-core/arrow.core/-non-empty-list/index.html)\\n and [`NonEmptySet`](https://apidocs.arrow-kt.io/arrow-core/arrow.core/-non-empty-set/index.html).\\n- Introduces [`arrow-core-serialization`](https://arrow-kt.io/learn/quickstart/serialization/)\\n to be used alongside KotlinX Serialization.\\n- Fixes a few issues found in the Release Candidate.\\n\\nRead more details in the full [Arrow 1.2.0 release announcement](https://xebia.com/blog/a-new-module-for-typed-errors-in-arrow-1-2-0/)."},{"id":"/2023/05/04/arrow-trajectory-kotlinconf","metadata":{"permalink":"/community/blog/2023/05/04/arrow-trajectory-kotlinconf","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-05-04-arrow-trajectory-kotlinconf.md","source":"@site/content/blog/2023-05-04-arrow-trajectory-kotlinconf.md","title":"Arrow 2.0\'s Trajectory - Video","description":"Watch Simon Vergauwen\'s presentation from KotlinConf 2023 about the history of Arrow, and the trajectory for Arrow 2.0.","date":"2023-05-04T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.09,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 2.0\'s Trajectory - Video","image":"https://img.youtube.com/vi/tplA17M9Y4Q/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/tplA17M9Y4Q","event":"KotlinConf"},"unlisted":false,"prevItem":{"title":"Arrow releases stable 1.2.0 version","permalink":"/community/blog/2023/07/12/arrow-1-2-0"},"nextItem":{"title":"Nicer data transformation with KopyKat and Optics","permalink":"/community/blog/2023/05/04/data-transformation-kotlinconf"}},"content":"Watch [Simon Vergauwen](https://twitter.com/vergauwen_simon)\'s presentation from KotlinConf 2023 about the history of Arrow, and the trajectory for Arrow 2.0."},{"id":"/2023/05/04/data-transformation-kotlinconf","metadata":{"permalink":"/community/blog/2023/05/04/data-transformation-kotlinconf","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-05-04-data-transformation-kotlinconf.md","source":"@site/content/blog/2023-05-04-data-transformation-kotlinconf.md","title":"Nicer data transformation with KopyKat and Optics","description":"Watch Alejandro Serrano\'s presentation from KotlinConf 2023 about data transformation.","date":"2023-05-04T00:00:00.000Z","tags":[{"label":"optics","permalink":"/community/blog/tags/optics"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.365,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Nicer data transformation with KopyKat and Optics","image":"https://img.youtube.com/vi/atV8liVgd3w/maxresdefault.jpg","category":"videos","tags":["optics","videos"],"link":"https://youtu.be/atV8liVgd3w","event":"KotlinConf"},"unlisted":false,"prevItem":{"title":"Arrow 2.0\'s Trajectory - Video","permalink":"/community/blog/2023/05/04/arrow-trajectory-kotlinconf"},"nextItem":{"title":"Typed Error Handling in Kotlin","permalink":"/community/blog/2023/04/17/typed-error-handling-in-kotlin"}},"content":"Watch [Alejandro Serrano](https://twitter.com/trupill)\'s presentation from KotlinConf 2023 about data transformation.\\n\\nData classes are incredibly useful when modeling our domain in an immutable way. The Kotlin compiler gives us many niceties, including \'copy\' to create a new value based on a previous one. However, this \'copy\' often falls short. This talk explores two alternatives: KopyKat, a plug-in to generate additional variations of \'copy\', and Arrow Optics, a whole framework to transform this immutable data."},{"id":"/2023/04/17/typed-error-handling-in-kotlin","metadata":{"permalink":"/community/blog/2023/04/17/typed-error-handling-in-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-04-17-typed-error-handling-in-kotlin.md","source":"@site/content/blog/2023-04-17-typed-error-handling-in-kotlin.md","title":"Typed Error Handling in Kotlin","description":"A comparative study about several typed-error handling practices in Kotlin.","date":"2023-04-17T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.585,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Typed Error Handling in Kotlin","image":"https://miro.medium.com/v2/resize:fit:4800/0*kOFUN-7oR7gyGXu_","category":"articles","tags":["core","articles"],"link":"https://medium.com/@mitchellyuwono/typed-error-handling-in-kotlin-11ff25882880"},"unlisted":false,"prevItem":{"title":"Nicer data transformation with KopyKat and Optics","permalink":"/community/blog/2023/05/04/data-transformation-kotlinconf"},"nextItem":{"title":"Arrow 2.0\'s Trajectory","permalink":"/community/blog/2023/04/16/arrow-2-0-trajectory"}},"content":"A comparative study about several typed-error handling practices in Kotlin.\\n\\nThere are various approaches to error handling in the Kotlin community. \\nIn this article we\u2019ve explored a small subset of typed error handling practices in the community. \\n\\nFrom the approaches explored, there were three patterns that aligns with Kotlin recommendation with \\nrelatively low cognitive complexity including: Sealed class matching with early returns, Arrow\'s `either { }` builder, \\nand Arrow\'s `context(Raise)` with context-receivers. \\n\\nArrow\'s `context(Raise)` achieved the most optimized score on all aspects of \\ndeveloper productivity. This includes having the lowest cognitive complexity, the lowest cyclomatic complexity \\nas well as the most succinct with the least lines of codes.\\n\\nRead the full article: [Typed Error Handling in Kotlin](https://medium.com/@mitchellyuwono/typed-error-handling-in-kotlin-11ff25882880)."},{"id":"/2023/04/16/arrow-2-0-trajectory","metadata":{"permalink":"/community/blog/2023/04/16/arrow-2-0-trajectory","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-04-16-arrow-2-0-trajectory.md","source":"@site/content/blog/2023-04-16-arrow-2-0-trajectory.md","title":"Arrow 2.0\'s Trajectory","description":"A full transcript and the slides from Simon Vergauwen\'s presentation from KotlinConf 2023 about the history of Arrow and where it\'s going.","date":"2023-04-16T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"slidedecks","permalink":"/community/blog/tags/slidedecks"}],"readingTime":0.11,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 2.0\'s Trajectory","image":"https://nomisrev.github.io/assets/KotlinConf%20-%20Arrow\'s%202.0%20Trajectory/KotlinConf%20-%20Arrow\'s%202.0%20Trajectory%20-%20Simon.001.png","category":"slidedecks","tags":["core","slidedecks"],"link":"https://nomisrev.github.io/arrows-2-0-trajectory/","event":"Kotlin Conf"},"unlisted":false,"prevItem":{"title":"Typed Error Handling in Kotlin","permalink":"/community/blog/2023/04/17/typed-error-handling-in-kotlin"},"nextItem":{"title":"Arrow 1.2.0-RC Release Summary","permalink":"/community/blog/2023/04/04/arrow-1-2-0-rc-summary"}},"content":"A full transcript and the slides from [Simon Vergauwen\'s](https://twitter.com/vergauwen_simon) presentation from KotlinConf 2023 about the history of Arrow and where it\'s going."},{"id":"/2023/04/04/arrow-1-2-0-rc-summary","metadata":{"permalink":"/community/blog/2023/04/04/arrow-1-2-0-rc-summary","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-04-04-arrow-1-2-0-rc-summary.md","source":"@site/content/blog/2023-04-04-arrow-1-2-0-rc-summary.md","title":"Arrow 1.2.0-RC Release Summary","description":"We\'re excited to announce Arrow 1.2.0-RC alongside a new Arrow website. To briefly summarize, this release:","date":"2023-04-04T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.27,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 1.2.0-RC Release Summary","image":"https://xebia.com/wp-content/uploads/2023/04/arrow-1-2-0-rc-twitter.jpg","category":"articles","tags":["core","articles"],"link":"https://xebia.com/blog/arrow-1-2-0-rc-is-now-available/"},"unlisted":false,"prevItem":{"title":"Arrow 2.0\'s Trajectory","permalink":"/community/blog/2023/04/16/arrow-2-0-trajectory"},"nextItem":{"title":"Functional Fun in Kotlin","permalink":"/community/blog/2023/02/04/functional-fun-kotlin"}},"content":"We\'re excited to announce Arrow 1.2.0-RC alongside a new Arrow website. To briefly summarize, this release:\\n\\n- Introduces a brand new [typed errors](http://arrow-kt.io/learn/typed-errors/working-with-typed-errors/) module.\\n- Adds more options for [resilience](http://arrow-kt.io/learn/resilience/).\\n- Marks every function and type we intend to remove in 2.0 as `@Deprecated`.\\n\\nRead more details in the full [Arrow 1.2.0 release announcement](https://xebia.com/blog/arrow-1-2-0-rc-is-now-available/)."},{"id":"/2023/02/04/functional-fun-kotlin","metadata":{"permalink":"/community/blog/2023/02/04/functional-fun-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-02-04-functional-fun-kotlin.md","source":"@site/content/blog/2023-02-04-functional-fun-kotlin.md","title":"Functional Fun in Kotlin","description":"Simon Vergauwen shares why he thinks Kotlin is great language to do modern functional programming, and why he believes it\'s perhaps the best language to do modern mainstream (hardcore) functional programming.","date":"2023-02-04T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"slidedecks","permalink":"/community/blog/tags/slidedecks"}],"readingTime":0.155,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Functional Fun in Kotlin","image":"https://files.speakerdeck.com/presentations/717144e6f3f54fd7aca2215fff36c2b3/preview_slide_0.jpg","category":"slidedecks","tags":["core","slidedecks"],"link":"https://speakerdeck.com/nomisrev/functional-fun-in-kotlin","event":"FOSDEM"},"unlisted":false,"prevItem":{"title":"Arrow 1.2.0-RC Release Summary","permalink":"/community/blog/2023/04/04/arrow-1-2-0-rc-summary"},"nextItem":{"title":"CodelyTV Interview with Raul Raja","permalink":"/community/blog/2023/01/03/codelytv-interview"}},"content":"[Simon Vergauwen](https://twitter.com/vergauwen_simon) shares why he thinks Kotlin is great language to do modern functional programming, and why he believes it\'s perhaps the best language to do modern mainstream (hardcore) functional programming."},{"id":"/2023/01/03/codelytv-interview","metadata":{"permalink":"/community/blog/2023/01/03/codelytv-interview","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-01-03-codelytv-interview.md","source":"@site/content/blog/2023-01-03-codelytv-interview.md","title":"CodelyTV Interview with Raul Raja","description":"An interview with Arrow maintainer Ra\xfal Raja by Rafa G\xf3mez on CodelyTV.","date":"2023-01-03T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.06,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"CodelyTV Interview with Raul Raja","image":"https://img.youtube.com/vi/8WdprhzmQe4/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/8WdprhzmQe4"},"unlisted":false,"prevItem":{"title":"Functional Fun in Kotlin","permalink":"/community/blog/2023/02/04/functional-fun-kotlin"},"nextItem":{"title":"Actions as Data","permalink":"/community/blog/2022/12/01/actions-as-data"}},"content":"An interview with Arrow maintainer Ra\xfal Raja by Rafa G\xf3mez on CodelyTV."},{"id":"/2022/12/01/actions-as-data","metadata":{"permalink":"/community/blog/2022/12/01/actions-as-data","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-actions-as-data.md","source":"@site/content/blog/2022-12-01-actions-as-data.md","title":"Actions as Data","description":"A presentation by Alejandro Serrano at Advanced Kotlin Dev Day 2022.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.055,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Actions as Data","image":"https://img.youtube.com/vi/ujzZITapUwA/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/ujzZITapUwA"},"unlisted":false,"prevItem":{"title":"CodelyTV Interview with Raul Raja","permalink":"/community/blog/2023/01/03/codelytv-interview"},"nextItem":{"title":"Context Receivers: Kotlin\'s new secret sauce","permalink":"/community/blog/2022/12/01/context-receivers"}},"content":"A presentation by Alejandro Serrano at Advanced Kotlin Dev Day 2022."},{"id":"/2022/12/01/context-receivers","metadata":{"permalink":"/community/blog/2022/12/01/context-receivers","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-context-receivers.md","source":"@site/content/blog/2022-12-01-context-receivers.md","title":"Context Receivers: Kotlin\'s new secret sauce","description":"Alejandro Serrano\'s presentation from Advanced Kotlin Dev Day 2022 about context receivers.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.06,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Context Receivers: Kotlin\'s new secret sauce","image":"https://img.youtube.com/vi/2oiRCYnqhDs/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/2oiRCYnqhDs"},"unlisted":false,"prevItem":{"title":"Actions as Data","permalink":"/community/blog/2022/12/01/actions-as-data"},"nextItem":{"title":"Functional Error Handling - A Practical Approach","permalink":"/community/blog/2022/12/01/functional-error-handling"}},"content":"Alejandro Serrano\'s presentation from Advanced Kotlin Dev Day 2022 about context receivers."},{"id":"/2022/12/01/functional-error-handling","metadata":{"permalink":"/community/blog/2022/12/01/functional-error-handling","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-functional-error-handling.md","source":"@site/content/blog/2022-12-01-functional-error-handling.md","title":"Functional Error Handling - A Practical Approach","description":"A presentation by Bas de Groot at Advanced Kotlin Dev Day 2022.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.06,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Functional Error Handling - A Practical Approach","image":"https://img.youtube.com/vi/T04ynq2IVFs/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/T04ynq2IVFs"},"unlisted":false,"prevItem":{"title":"Context Receivers: Kotlin\'s new secret sauce","permalink":"/community/blog/2022/12/01/context-receivers"},"nextItem":{"title":"Functional Flowing","permalink":"/community/blog/2022/12/01/functional-flowing"}},"content":"A presentation by Bas de Groot at Advanced Kotlin Dev Day 2022."},{"id":"/2022/12/01/functional-flowing","metadata":{"permalink":"/community/blog/2022/12/01/functional-flowing","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-functional-flowing.md","source":"@site/content/blog/2022-12-01-functional-flowing.md","title":"Functional Flowing","description":"Simon Vergauwen shows how to leverage KotlinX Flow to describe powerful programs and build pipelines to transform and manipulate data in an efficient streaming way.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.125,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Functional 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way."},{"id":"/2022/12/01/graceful-shutdown-structured-concurrency","metadata":{"permalink":"/community/blog/2022/12/01/graceful-shutdown-structured-concurrency","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-graceful-shutdown-structured-concurrency.md","source":"@site/content/blog/2022-12-01-graceful-shutdown-structured-concurrency.md","title":"Graceful Shutdown with Structured Concurrency","description":"A presentation by Simon Vergauwen at Advanced Kotlin Dev Day 2022.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.055,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Graceful Shutdown with Structured 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Let\'s do a case study of a successful implementation done by our team in the world\'s largest SaaS org, Salesforce, using Kotlin and Arrow.","date":"2020-11-19T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.33,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Fight Complexity with Functional Programming","image":"https://img.youtube.com/vi/Dvr6gx4XaD8/hqdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/Dvr6gx4XaD8","event":"All Things Open 2020"},"unlisted":false,"prevItem":{"title":"Roll your own Computation blocks in Kotlin","permalink":"/community/blog/2020/12/16/roll-your-own-computation-blocks-kotlin"},"nextItem":{"title":"Arrow Promoted to Adopt by Technology Radar","permalink":"/community/blog/2020/10/28/arrow-promoted-to-adopt"}},"content":"A Metric-driven approach to reduce Cognitive Complexity in a code base, using Functional Programming, demoed hands-on, by solving a complex real-world ubiquitous design challenge - REST API Bulk Request Validation, with an extensible Framework that separates what-to-do (Validations) from how-to-do (Validation Orchestration). Let\'s do a case study of a successful implementation done by our team in the world\'s largest SaaS org, Salesforce, using Kotlin and Arrow."},{"id":"/2020/10/28/arrow-promoted-to-adopt","metadata":{"permalink":"/community/blog/2020/10/28/arrow-promoted-to-adopt","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-10-28-arrow-promoted-to-adopt.md","source":"@site/content/blog/2020-10-28-arrow-promoted-to-adopt.md","title":"Arrow Promoted to Adopt by Technology Radar","description":"Arrow is promoted as the functional companion for Kotlin\'s standard library. Indeed, the package of ready-to-use higher-level abstractions delivered by Arrow has proven so useful that our teams now consider Arrow a sensible default when working with Kotlin. Recently, in preparation for the 1.0 release, the Arrow team introduced several changes, including the addition of new modules but also some deprecations and removals.","date":"2020-10-28T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.315,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow Promoted to Adopt by Technology Radar","image":"https://static.thoughtworks.com/images/radar/2020-10/en/tech-radar-card.png","category":"articles","tags":["core","articles"],"link":"https://www.thoughtworks.com/radar/languages-and-frameworks/arrow"},"unlisted":false,"prevItem":{"title":"Fight Complexity with Functional Programming","permalink":"/community/blog/2020/11/19/fight-complexity-with-functional-programming"},"nextItem":{"title":"How to fix the pain of modifying Kotlin nested data classes","permalink":"/community/blog/2020/10/28/modifying-kotlin-nested-data-classes"}},"content":"Arrow is promoted as the functional companion for Kotlin\'s standard library. Indeed, the package of ready-to-use higher-level abstractions delivered by Arrow has proven so useful that our teams now consider Arrow a sensible default when working with Kotlin. Recently, in preparation for the 1.0 release, the Arrow team introduced several changes, including the addition of new modules but also some deprecations and removals."},{"id":"/2020/10/28/modifying-kotlin-nested-data-classes","metadata":{"permalink":"/community/blog/2020/10/28/modifying-kotlin-nested-data-classes","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-10-28-modifying-kotlin-nested-data-classes.md","source":"@site/content/blog/2020-10-28-modifying-kotlin-nested-data-classes.md","title":"How to fix the pain of modifying Kotlin nested data classes","description":"Lenses are not part of the Kotlin Standard Library yet, so we will need to use an Open Source library called Arrow-kt. Arrow-kt is a huge community effort to bring some of the missing functional programming features to Kotlin.","date":"2020-10-28T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.195,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"How to fix the pain of modifying Kotlin nested data classes","image":"https://i2.wp.com/ivanmorgillo.com/wp-content/uploads/2020/10/pexels-photo-712786.jpeg","category":"articles","tags":["core","articles"],"link":"https://ivanmorgillo.com/2020/10/28/how-to-fix-the-pain-of-modifying-kotlin-nested-data-classes/"},"unlisted":false,"prevItem":{"title":"Arrow Promoted to Adopt by Technology Radar","permalink":"/community/blog/2020/10/28/arrow-promoted-to-adopt"},"nextItem":{"title":"Technology Radar Promotes Arrow to \'Adopt\'","permalink":"/community/blog/2020/10/28/technology-radar-promotes-arrow"}},"content":"Lenses are not part of the Kotlin Standard Library yet, so we will need to use an Open Source library called Arrow-kt. Arrow-kt is a huge community effort to bring some of the missing functional programming features to Kotlin."},{"id":"/2020/10/28/technology-radar-promotes-arrow","metadata":{"permalink":"/community/blog/2020/10/28/technology-radar-promotes-arrow","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-10-28-technology-radar-promotes-arrow.md","source":"@site/content/blog/2020-10-28-technology-radar-promotes-arrow.md","title":"Technology Radar Promotes Arrow to \'Adopt\'","description":"Arrow has been promoted to \u201cAdopt\u201d by ThoughtWorks\u2019 technology guide Technology Radar.","date":"2020-10-28T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.06,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Technology Radar Promotes Arrow to 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Radar*."},{"id":"/2020/10/08/writing-kotlin-compiler-plugins-talk","metadata":{"permalink":"/community/blog/2020/10/08/writing-kotlin-compiler-plugins-talk","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-10-08-writing-kotlin-compiler-plugins-talk.md","source":"@site/content/blog/2020-10-08-writing-kotlin-compiler-plugins-talk.md","title":"Writing Kotlin Compiler Plugins with Arrow Meta","description":"Lean how to write and test compiler plugins and IDE plugins with Arrow Meta.","date":"2020-10-08T00:00:00.000Z","tags":[{"label":"meta","permalink":"/community/blog/tags/meta"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.07,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Writing Kotlin Compiler Plugins with Arrow 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ArrowKt","permalink":"/community/blog/2020/06/11/asynchronisme-et-hexagone-en-kotlin-avec-Arrow"}},"content":"Type Proofs is a new compiler plugin built on Arrow Meta enabling new features in the Kotlin type system, such as Type Classes, Union Types, Type Refinements, and many other extensions that make Functional Programming easier in Kotlin.\\n\\nType Proofs propositions are expressed as extension functions that unlock new relationships between types ad-hoc whilst remaining fully compatible with subtype polymorphism and the existing inheritance type system.\\n\\nThis talk demonstrates some of the new features the Arrow team is introducing in Arrow at the type level and IDE and how others can benefit from them when building libraries and applications."},{"id":"/2020/06/11/asynchronisme-et-hexagone-en-kotlin-avec-Arrow","metadata":{"permalink":"/community/blog/2020/06/11/asynchronisme-et-hexagone-en-kotlin-avec-Arrow","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-06-11-asynchronisme-et-hexagone-en-kotlin-avec-Arrow.md","source":"@site/content/blog/2020-06-11-asynchronisme-et-hexagone-en-kotlin-avec-Arrow.md","title":"Asynchronisme et hexagone en Kotlin avec ArrowKt","description":"J\'aime bien le DDD et surtout les architectures hexagonales. Avoir un domaine auto-portant et non coupl\xe9 \xe0 des blocs techniques comme Spring (ou autres) apporte beaucoup dans la testabilit\xe9 et l\'\xe9volutivit\xe9 de l\'application.","date":"2020-06-11T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.665,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Asynchronisme et hexagone en Kotlin avec ArrowKt","image":"https://img.youtube.com/vi/moJpV-BgezM/hqdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/moJpV-BgezM","event":"Lambda Lille"},"unlisted":false,"prevItem":{"title":"Type Proofs and FP for the Kotlin Type System","permalink":"/community/blog/2020/06/16/type-proofs-fp-kotlin-talk"},"nextItem":{"title":"Arrow Fx: Functional Domain Modeling with Kotlin","permalink":"/community/blog/2020/06/05/functional-domain-modeling-kotlin"}},"content":"J\'aime bien le DDD et surtout les architectures hexagonales. Avoir un domaine auto-portant et non coupl\xe9 \xe0 des blocs techniques comme Spring (ou autres) apporte beaucoup dans la testabilit\xe9 et l\'\xe9volutivit\xe9 de l\'application.\\nLes mod\xe8les d\'asynchronismes (programmation r\xe9active, retard\xe9e, coroutines...) emp\xeachent la dissociation stricte de notre mod\xe8le m\xe9tier et de notre code infra dans un langage comme Kotlin.\\nOblig\xe9 d\'utiliser une lib de coroutine ou autre programmation reactive.\\nDeux solutions s\'offrent alors :\\n- D\xe9finir que les mod\xe8les d\'asynchronisme sont des invariants de notre domaine et accepter ce couplage\\n- Chercher comment mod\xe9liser notre domaine comme un ensemble de comportements asynchrones\\nDans ce talk nous allons voir comment r\xe9aliser la deuxi\xe8me solution en utilisant la librairie Arrow et son mod\xe8le conceptuel d\'asynchronisme pour nous permettre de d\xe9coupler notre domaine de toute logique d\'infrastructure."},{"id":"/2020/06/05/functional-domain-modeling-kotlin","metadata":{"permalink":"/community/blog/2020/06/05/functional-domain-modeling-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-06-05-functional-domain-modeling-kotlin.md","source":"@site/content/blog/2020-06-05-functional-domain-modeling-kotlin.md","title":"Arrow Fx: Functional Domain Modeling with Kotlin","description":"Arrow Fx is a purely functional concurrency framework for Kotlin\u2019s suspend system.","date":"2020-06-05T00:00:00.000Z","tags":[{"label":"fx","permalink":"/community/blog/tags/fx"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.405,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow Fx: Functional Domain Modeling with Kotlin","image":"https://img.youtube.com/vi/6sw8GAhUJz0/maxresdefault.jpg","category":"videos","tags":["fx","videos"],"link":"https://youtu.be/6sw8GAhUJz0","event":"Kotliners 2020"},"unlisted":false,"prevItem":{"title":"Asynchronisme et hexagone en Kotlin avec ArrowKt","permalink":"/community/blog/2020/06/11/asynchronisme-et-hexagone-en-kotlin-avec-Arrow"},"nextItem":{"title":"Type Proofs and FP for the Kotlin Type System","permalink":"/community/blog/2020/05/27/type-proofs-fp-kotlin-talk"}},"content":"Arrow Fx is a purely functional concurrency framework for Kotlin\u2019s suspend system.\\n\\nIn this talk, we will learn how typed functional programming and functional domain modeling powered by Arrow Optics, Fx, and Meta can be applied to assemble powerful applications and architectures from small and simple building blocks.\\n\\nSimon and Raul will cover important topics and patterns such as optics, union types, refined types, type classes, automatic task cancellation, safe resource handling, and compare how Arrow Fx differs from KotlinX coroutines."},{"id":"/2020/05/27/type-proofs-fp-kotlin-talk","metadata":{"permalink":"/community/blog/2020/05/27/type-proofs-fp-kotlin-talk","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-05-27-type-proofs-fp-kotlin-talk.md","source":"@site/content/blog/2020-05-27-type-proofs-fp-kotlin-talk.md","title":"Type Proofs and FP for the Kotlin Type System","description":"Type Proofs is a new compiler plugin built on Arrow Meta enabling new features in the Kotlin type system, such as Type Classes, Union Types, Type Refinements, and many other extensions that make Functional Programming easier in Kotlin.","date":"2020-05-27T00:00:00.000Z","tags":[{"label":"meta","permalink":"/community/blog/tags/meta"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.495,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Type Proofs and FP for the Kotlin Type 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demonstrates some of the new features the Arrow team is introducing in Arrow at the type level and IDE and how others can benefit from them when building libraries and applications."},{"id":"/2020/05/06/android-architectures-arrow-fx","metadata":{"permalink":"/community/blog/2020/05/06/android-architectures-arrow-fx","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-05-06-android-architectures-arrow-fx.md","source":"@site/content/blog/2020-05-06-android-architectures-arrow-fx.md","title":"Android architectures with Arrow Fx","description":"May 2020 Online Kotlin Meetup","date":"2020-05-06T00:00:00.000Z","tags":[{"label":"fx","permalink":"/community/blog/tags/fx"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.43,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Android architectures with Arrow Fx","image":"https://img.youtube.com/vi/r4D-oFd6wmY/maxresdefault.jpg","category":"videos","tags":["fx","videos"],"link":"https://youtu.be/r4D-oFd6wmY","event":"May 2020 Online Kotlin Meetup"},"unlisted":false,"prevItem":{"title":"Type Proofs and FP for the Kotlin Type System","permalink":"/community/blog/2020/05/27/type-proofs-fp-kotlin-talk"},"nextItem":{"title":"Writing a Kotlin Compiler Plugin with Arrow Meta","permalink":"/community/blog/2020/04/08/writing-compiler-plugin-with-with-arrow-meta"}},"content":"May 2020 Online Kotlin Meetup\\n\\nDaniel Montoya Ramos - Senior Software Engineer @47deg\\nAndroid Jetpack Compose\\n\\nDani will show a new way of building UI\'s in Android using Jetpack Compose, comparing Imperative vs Declarative approaches. He\'ll look at managing state changes, composing functions as well as some of the gotchas and wishes for the future.\\n\\nAlberto Ballano - Senior Software Engineer @47deg\\nAndroid architectures with Arrow Fx\\n\\nAlberto will talk about typical Android architectures, and how can they benefit from Functional Programming techniques available in Arrow."},{"id":"/2020/04/08/writing-compiler-plugin-with-with-arrow-meta","metadata":{"permalink":"/community/blog/2020/04/08/writing-compiler-plugin-with-with-arrow-meta","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-04-08-writing-compiler-plugin-with-with-arrow-meta.md","source":"@site/content/blog/2020-04-08-writing-compiler-plugin-with-with-arrow-meta.md","title":"Writing a Kotlin Compiler Plugin with Arrow Meta","description":"Learn how to write and test the debuglog compiler plugin in Arrow Meta. Here is the compiler plugin debulog-arrow-meta explained in the article.","date":"2020-04-08T00:00:00.000Z","tags":[{"label":"meta","permalink":"/community/blog/tags/meta"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.115,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Writing a Kotlin Compiler Plugin with Arrow Meta","image":"https://meta.arrow-kt.io/img/demos/hello-world-compiler-plugin.gif","category":"articles","tags":["meta","articles"],"link":"https://medium.com/@heyitsmohit/writing-kotlin-compiler-plugin-with-arrow-meta-cf7b3689aa3e"},"unlisted":false,"prevItem":{"title":"Android architectures with Arrow Fx","permalink":"/community/blog/2020/05/06/android-architectures-arrow-fx"},"nextItem":{"title":"Template-Oriented-Programming to Ship Faster, Part-1","permalink":"/community/blog/2020/04/06/template-oriented-programming-talk"}},"content":"Learn how to write and test the [debuglog](https://github.com/kevinmost/debuglog) compiler plugin in Arrow Meta. Here is the compiler plugin [debulog-arrow-meta](https://github.com/msya/debuglog-arrow-meta) explained in the article."},{"id":"/2020/04/06/template-oriented-programming-talk","metadata":{"permalink":"/community/blog/2020/04/06/template-oriented-programming-talk","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-04-06-template-oriented-programming-talk.md","source":"@site/content/blog/2020-04-06-template-oriented-programming-talk.md","title":"Template-Oriented-Programming to Ship Faster, Part-1","description":"Learn about the magic of Ad-hoc polymorphism using Arrow typeclasses with simple examples.","date":"2020-04-06T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.065,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Template-Oriented-Programming to Ship Faster, Part-1","image":"https://img.youtube.com/vi/_QBlKtUY6ac/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/_QBlKtUY6ac","event":"Kotlin User Group, Hyderabad, Online Meetup"},"unlisted":false,"prevItem":{"title":"Writing a Kotlin Compiler Plugin with Arrow Meta","permalink":"/community/blog/2020/04/08/writing-compiler-plugin-with-with-arrow-meta"},"nextItem":{"title":"Template-Oriented-Programming to Ship Faster","permalink":"/community/blog/2020/04/06/template-oriented-programming"}},"content":"Learn about the magic of Ad-hoc polymorphism using Arrow typeclasses with simple examples."},{"id":"/2020/04/06/template-oriented-programming","metadata":{"permalink":"/community/blog/2020/04/06/template-oriented-programming","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-04-06-template-oriented-programming.md","source":"@site/content/blog/2020-04-06-template-oriented-programming.md","title":"Template-Oriented-Programming to Ship Faster","description":"With a POC using Spring-fu + Kotlin + Arrow, let\'s Convert Monomorphic code (for common use-cases such as Auth, Validation) to Polymorphic reusable templates, to be reused among heterogeneous services built on different tech-stacks (blocking/non-blocking). 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Arrow."},{"id":"/2017/11/09/pragmatic-functionalist","metadata":{"permalink":"/community/blog/2017/11/09/pragmatic-functionalist","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2017-11-09-pragmatic-functionalist.md","source":"@site/content/blog/2017-11-09-pragmatic-functionalist.md","title":"Kotlin for the Pragmatic Functionalist","description":"An introduction to Arrow and the enhancements it brings to Kotlin\'s standard library.","date":"2017-11-09T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.065,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Kotlin for the Pragmatic Functionalist","image":"https://img.youtube.com/vi/s9oMED6ZikQ/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://www.youtube.com/watch?v=s9oMED6ZikQ","event":"KotlinConf, San Francisco"},"unlisted":false,"prevItem":{"title":"Architectures Using Functional Programming Concepts","permalink":"/community/blog/2017/11/17/architectures"},"nextItem":{"title":"Functional Programming in Kotlin","permalink":"/community/blog/2017/11/02/fp-kotlin"}},"content":"An introduction to Arrow and the enhancements it brings to Kotlin\'s standard library."},{"id":"/2017/11/02/fp-kotlin","metadata":{"permalink":"/community/blog/2017/11/02/fp-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2017-11-02-fp-kotlin.md","source":"@site/content/blog/2017-11-02-fp-kotlin.md","title":"Functional Programming in Kotlin","description":"An ongoing blog series introducing Functional Programming architectures from scratch","date":"2017-11-02T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"fx","permalink":"/community/blog/tags/fx"},{"label":"mtl","permalink":"/community/blog/tags/mtl"},{"label":"tutorials","permalink":"/community/blog/tags/tutorials"}],"readingTime":0.145,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Functional Programming in Kotlin","image":"https://cdn-images-1.medium.com/max/600/1*NpQ5mqoY4SH5iwsWG35RqQ.jpeg","category":"tutorials","tags":["core","fx","mtl","tutorials"],"link":"https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-does-it-make-sense-36ad07e6bacf"},"unlisted":false,"prevItem":{"title":"Kotlin for the Pragmatic Functionalist","permalink":"/community/blog/2017/11/09/pragmatic-functionalist"},"nextItem":{"title":"Functional approach to Android architecture using Kotlin","permalink":"/community/blog/2017/10/20/functional-approach"}},"content":"An ongoing blog series introducing Functional Programming architectures from scratch\\n\\n[Kotlin Functional Programming: Does it make sense?](https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-does-it-make-sense-36ad07e6bacf)\\n\\n[Kotlin Functional Programming I: Monad Stack](https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-i-monad-stack-518d1bd8fbee)\\n\\n[Kotlin Functional Programming II: Monad Transformers](https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-ii-monad-transformers-b1f020f14dd8)"},{"id":"/2017/10/20/functional-approach","metadata":{"permalink":"/community/blog/2017/10/20/functional-approach","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2017-10-20-functional-approach.md","source":"@site/content/blog/2017-10-20-functional-approach.md","title":"Functional approach to Android architecture using Kotlin","description":"Move side effects to the edges of the system, implement a functional oriented architecture for Android apps based on purity.","date":"2017-10-20T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.1,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Functional approach to Android architecture using Kotlin","image":"https://img.youtube.com/vi/qGef3sFAIxU/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://www.youtube.com/watch?v=qGef3sFAIxU","event":"Mobilization 7, \u0141\xf3d\u017a"},"unlisted":false,"prevItem":{"title":"Functional Programming in Kotlin","permalink":"/community/blog/2017/11/02/fp-kotlin"},"nextItem":{"title":"Handling exceptions in Arrow","permalink":"/community/blog/2017/09/17/handling-exceptions-arrow"}},"content":"Move side effects to the edges of the system, implement a functional oriented architecture for Android apps based on purity."},{"id":"/2017/09/17/handling-exceptions-arrow","metadata":{"permalink":"/community/blog/2017/09/17/handling-exceptions-arrow","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2017-09-17-handling-exceptions-arrow.md","source":"@site/content/blog/2017-09-17-handling-exceptions-arrow.md","title":"Handling exceptions in Arrow","description":"@uris77 explains how to use Try in real world examples.","date":"2017-09-17T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.095,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Handling exceptions in Arrow","image":"/img/blog-image-header.png","category":"articles","tags":["core","articles"],"link":"https://www.spantree.net/blog/2017/09/15/kotlin-exception-handling-with-kategory.html"},"unlisted":false,"prevItem":{"title":"Functional approach to Android architecture using Kotlin","permalink":"/community/blog/2017/10/20/functional-approach"}},"content":"[@uris77](https://github.com/uris77) explains how to use [Try](https://arrow-kt.io/docs/apidocs/arrow-core-data/arrow.core/-try/) in real world examples.\\n\\n[Handling Kotlin Exceptions with Arrow \u2013 A Functional Approach](https://www.spantree.net/blog/2017/09/15/kotlin-exception-handling-with-kategory.html)"}]}}')}}]); \ No newline at end of file diff --git a/assets/js/e41df212.d3cb67b2.js b/assets/js/e41df212.d3cb67b2.js new file mode 100644 index 00000000..19ec64f6 --- /dev/null +++ b/assets/js/e41df212.d3cb67b2.js @@ -0,0 +1 @@ +"use strict";(self.webpackChunkarrow_website=self.webpackChunkarrow_website||[]).push([[2348],{22761:e=>{e.exports=JSON.parse('{"archive":{"blogPosts":[{"id":"/2024/10/03/arrow-open-space","metadata":{"permalink":"/community/blog/2024/10/03/arrow-open-space","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2024-10-03-arrow-open-space.md","source":"@site/content/blog/2024-10-03-arrow-open-space.md","title":"Arrow Open Space @ Lambda World","description":"The first Arrow & Fuctional Kotlin Open Space is taking place as part of Lambda World! This post contains the preliminary schedule, and shall be updated after the Open Space takes place with additional material, slides, and videos.","date":"2024-10-03T00:00:00.000Z","tags":[{"label":"articles","permalink":"/community/blog/tags/articles"},{"label":"community","permalink":"/community/blog/tags/community"}],"readingTime":1.875,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow Open Space @ Lambda World","category":"articles","tags":["articles","community"],"image":"https://pub-c7459893ae854bbdb5ad00855f44c0c8.r2.dev/LandingPage_Lambda/Lambda_Logo_Blue.svg"},"unlisted":false,"nextItem":{"title":"Arrow plug-in for IntelliJ 0.1 is here!","permalink":"/community/blog/2024/06/01/intellij-plugin"}},"content":"The first [Arrow & Fuctional Kotlin Open Space](https://www.lambda.world/workshops/Arrow%20%26%20Functional%20Kotlin%20Open%20Space/) is taking place as part of [Lambda World](https://lambda.world)! This post contains the preliminary schedule, and shall be updated after the Open Space takes place with additional material, slides, and videos.\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n
14.30 - 15.00Introduction to Arrow libraries by Simon Vergauwen
15.00 - 16.30Unconference and Build together (in parallel, see below)
16.30 - 16.50Closing remarks
\\n\\n## Unconference\\n\\nWe have a nice room, some sweets, and a nice projector. The perfect setup to share some knowledge about Arrow and Functional Kotlin! Our goal with the Unconference is to bring together people who can talk about something and people who want to learn about something.\\n\\n_How does it work?_ Please talk to one of the people in charge so they can change the spreadsheet.\\n\\n- If you want to learn about a topic...\\n - If the topic is not yet in the spreadsheet, add it in the first column with the _Requested_ status.\\n - If the topic is in the spreadsheet, contact the potential speaker.\\n- If you want to talk about a topic...\\n - If it is already in the spreadsheet, shout it out loud and let the talk begin!\\n - If not, add your topic and name with the _Waiting_ status, and wait for somebody to request it.\\n- Once the talk begins, change it status to _In progress_, and once it is finished, move it to _Done_.\\n - It would be great if any material or code would be shared with the organizers, so we can later add it to this page.\\n\\n\\n\\n\\n## Build together\\n\\nThe goal of the Open Space is to learn. Many of us around are happy to help, so feel free to work in any project you want, and explore ways to use more functional features in your Kotlin. Once again, don\'t be shy to ask :)\\n\\nIf you are not sure about where to start, we have prepared a few tutorials and projects for you.\\n\\n- [Pok\xe9-Fun with Kotlin and Arrow](https://serranofp.com/poke-fun/): exercises about different parts of Arrow, and how you can apply them to a Compose Multiplatform project.\\n- [Example projects](https://arrow-kt.io/learn/design/projects/) from the Arrow documentation"},{"id":"/2024/06/01/intellij-plugin","metadata":{"permalink":"/community/blog/2024/06/01/intellij-plugin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2024-06-01-intellij-plugin.md","source":"@site/content/blog/2024-06-01-intellij-plugin.md","title":"Arrow plug-in for IntelliJ 0.1 is here!","description":"One of the main goals of the Arrow project is to produce libraries","date":"2024-06-01T00:00:00.000Z","tags":[{"label":"intellij","permalink":"/community/blog/tags/intellij"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":1.41,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow plug-in for IntelliJ 0.1 is here!","category":"articles","tags":["intellij","articles"]},"unlisted":false,"prevItem":{"title":"Arrow Open Space @ Lambda World","permalink":"/community/blog/2024/10/03/arrow-open-space"},"nextItem":{"title":"Arrow 1.2.3 release","permalink":"/community/blog/2024/02/28/arrow-1-2-3"}},"content":"One of the main goals of the Arrow project is to produce libraries\\nthat follow well-known Kotlin idioms, and we strive to make them\\nas discoverable as possible. Nevertheless, the surface of some\\ncomponents, like [typed errors](/learn/typed-errors/),\\nis quite large.\\nFor that reason, we have been busy in the last weeks preparing\\nthe first release of the\\n[Arrow plug-in for IntelliJ-based IDEs](https://plugins.jetbrains.com/plugin/24550-arrow).\\n\\nThis first version already focuses on three different aspects of\\nArrow usage where we found that an additional companion can make\\na big difference. The first aspect is the usage of typed errors:\\nthe IDE will now suggest missing `.bind()` or `.bindAll()`,\\nmapping of error using `withError`, and promoting idioms like\\n`ensure` whenever possible.\\n\\nThe second aspect is warning about wrong usages of Arrow APIs\\nwhich cannot be prevented by Kotlin\'s type system alone. This includes\\nescaping of `Raise` contexts -- for example, using `sequence` or\\n`flow` inside `either` --, using `Atomic` with primitive types \\n-- where `AtomicInt` or `AtomicBoolean` should be used instead --,\\nor matching on `Eval` instances directly instead of using the\\nprovided API -- which can easily lead to broken invariants.\\n\\nThe third aspect is applying some known recipes which may be hard\\nto know upfront. The first release includes a suggestion to add\\nthe corresponding [serializer](/learn/quickstart/serialization/)\\nwhen a type marked as `@Serializable` includes an Arrow Core type.\\nThis is an area which we would like to explore more, helping with\\nthe difficulties raised by the community.\\n\\nThe plug-in lives in a [separate repository](https://github.com/arrow-kt/arrow-intellij).\\nPlease let us know your experience, and don\'t be shy to open issues\\nwith suggestions for more features. They would help not only you\\nbut potentially every user of the Arrow library."},{"id":"/2024/02/28/arrow-1-2-3","metadata":{"permalink":"/community/blog/2024/02/28/arrow-1-2-3","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2024-02-28-arrow-1-2-3.md","source":"@site/content/blog/2024-02-28-arrow-1-2-3.md","title":"Arrow 1.2.3 release","description":"We are happy to announce the availability of version 1.2.3 of the Arrow collection of libraries.","date":"2024-02-28T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":4.65,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 1.2.3 release","category":"articles","tags":["core","articles"]},"unlisted":false,"prevItem":{"title":"Arrow plug-in for IntelliJ 0.1 is here!","permalink":"/community/blog/2024/06/01/intellij-plugin"},"nextItem":{"title":"Arrow releases stable 1.2.0 version","permalink":"/community/blog/2023/07/12/arrow-1-2-0"}},"content":"We are happy to announce the availability of version 1.2.3 of the Arrow collection of libraries.\\nAccording to our plan, this is the last non-bugfix release of the 1.x series.\\nFrom now on, our `main` branch targets Arrow 2.0, which should be the next major release.\\n\\nWe are incredibly thankful to the many people that have contributed to this release,\\nbringing new ideas and quite some code.\\n\\n:::info Please use 1.2.4\\n\\nVersion 1.2.3 of `arrow-core` changed the behavior of `Raise` computations returning\\nfunctions or sequences. This change [restricted some useful usages](https://github.com/arrow-kt/arrow/issues/3391),\\nso the team has decided to roll it back and keep the 1.2.1 behavior.\\n\\n:::\\n\\n## New features\\n\\nA version number like 1.2.3 sounds like a small bugfix release, but this is far from truth in\\nthis case: this release is full of new modules to help you be productive when writing Kotlin.\\n\\n### Improved focus on Compose\\n\\nArrow provides building blocks relevant to many projects using Kotlin.\\nA large part of our community is doing frontend work, and during the latest months,\\nthe team has been trying to understand their needs, in order to make Arrow\\na relevant tool in that space.\\n\\nFrom that journey, we have put together a new documentation page highlighting\\ndifferent ways in which Arrow may be useful in your Compose application.\\nThere is also a new [`arrow-optics-compose` module](/learn/immutable-data/lens/#integration-with-compose)\\nthat includes utilities to work with immutable data inside a `MutableState`\\nor `MutableStateFlow`.\\n\\nWe are eager to hear more use cases or needs where Arrow may help the lives\\nof Kotlin developers. Feel free to drop by the `#arrow` channel in the Kotlin Slack,\\nor open an issue or discussion in our [repository](https://github.com/arrow-kt/arrow).\\n\\n### Non-`suspend` resource management\\n\\n[Resource safety](/learn/coroutines/resource-safety/) in Arrow\\nhas been traditionally tied to the use of coroutines and `suspend` functions.\\nThis is the right choice for Kotlin-first libraries, like Ktor or Koin, but many\\nlibraries still come from a Java background where no such feature exists.\\nBeginning with this version, we provide two \\"variations\\" of resource management:\\n\\n- `Resource`, from the `arrow-fx-coroutines` module, is based on `suspend`\\n and ensures the desired behavior alongside coroutines (including cancellation).\\n- `AutoClose`, from the new `arrow-autoclose` module, provides almost the\\n same API as `Resource`, but without the `suspend` requirement.\\n\\n### Forward compatible `Eval`\\n\\nOne of our goals is to make the transition to 2.0 as smooth as possible.\\nYou can [already migrate](/learn/quickstart/migration/)\\nto the new APIs by using Arrow 1.2.3, and then ensuring that you get no deprecation warnings.\\n\\nDuring this process, we were [made aware](https://github.com/arrow-kt/arrow/issues/3039) that\\nthere was no clear story for the migration of `Eval`. On the other hand, the use cases are very narrow.\\nThe decision was to create a new [`arrow-eval` module](/learn/collections-functions/eval/),\\npresent since this release, and mark the one from `arrow-core` point the new module,\\ninstead of entirely removing this functionality from Arrow.\\n\\n### Collectors\\n\\nThe new [`arrow-collectors` module](/learn/collections-functions/collectors/)\\nallows composing operations over sequences of values\\n(lists, flows, sequences) while ensuring that the sequence is traversed only once.\\nThis property is especially relevant when building the sequence is expensive, or simply\\ncannot be reproduced, like a stream of data from a database or a flow of actions.\\n\\n## Improved features\\n\\nSeveral features in the library have been improved, to ensure that Arrow covers a variety\\nof use cases.\\n\\n### Lenses for sealed classes\\n\\nThis was once of the [older feature requests](https://github.com/arrow-kt/arrow/issues/2829)\\nstill in our issue tracker, which is now closed thanks to a wonderful\\n[contribution](https://github.com/arrow-kt/arrow/pull/3359)!\\n\\nFrom now on, the Optics KSP plug-in can generate\\n[lenses for sealed hierarchies](/learn/immutable-data/lens/#sealed-class-hierarchies),\\ngiven that the field lives in the common parent. For example, the following code\\n\\n```kotlin\\n@optics sealed interface User {\\n val name: String\\n\\n data class Person(override val name: String, val age: Int): User\\n data class Company(override val name: String, val vat: VATNumber): User\\n}\\n```\\n\\ngenerates from this version on both prisms for each choice, and a lens for `name`.\\n\\n### Higher-arity functions\\n\\nWe have traditionally been reluctant to add variations of `zip` with more than\\n10 parameters, because we felt that the narrow use cases did not balance out\\nthe increase in binary size. Since this release Arrow provides those functions\\nin a new `arrow-core-high-arity` module.\\n\\n### More accumulating functions for `Raise`\\n\\n[Typed errors](/learn/typed-errors/working-with-typed-errors/)\\nprovide two essential ways to [accumulate errors](/learn/typed-errors/working-with-typed-errors/#accumulating-errors): `zipOrAccumulate` and `mapOrAccumulate`. Those correspond\\nto accumulating over a fixed number of computations of different types, or\\naccumulating over an unknown quantity of computations with the same type.\\n\\nThe `mapOrAccumulate` function _always_ returns a new list. In some cases, you\\ndon\'t really care about this result, just about the iteration behavior.\\nThis is similar to the different between `map` and `forEach` in the standard\\nlibrary. From there Arrow takes the name of the new function: `forEachAccumulating`.\\n\\nOne potential use case is performing validation over elements of a list,\\nbut keeping the values intact.\\n\\n```kotlin\\npeople.forEachAccumulating { person ->\\n ensure(person.age >= 0) { InvalidAge(person.name) }\\n}\\n```\\n\\n### Better memoization\\n\\n[`MemoizedDeepRecursiveFunction`](/learn/collections-functions/recursive/#memoized-recursive-functions)\\nis a powerful tool to express recursive algorithms without worries over stack overflow or recomputation.\\nHowever, there was a lack of control over how memoized values were stored or evicted, which made the\\ntype less useful than intended.\\n\\nFrom this release on, there are new overloads to support custom memoization policies.\\nFurthermore, the new [`arrow-cache4k` module](/learn/collections-functions/recursive/#memoization-takes-memory)\\nprovides integration with the excellent\\n[cache4k](https://github.com/ReactiveCircus/cache4k) library.\\n\\n## More integrations\\n\\nAlthough not part of this release, we would like to highlight that\\n[Akkurate](https://akkurate.dev), which provides a wonderful DSL for validation over data,\\nhas released an [integration module for Arrow](https://akkurate.dev/docs/arrow-integration.html).\\nThis adds to the [rest of integrations](/learn/integrations/)\\nand shows the collaborative spirit of the Kotlin community."},{"id":"/2023/07/12/arrow-1-2-0","metadata":{"permalink":"/community/blog/2023/07/12/arrow-1-2-0","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-07-12-arrow-1-2-0.md","source":"@site/content/blog/2023-07-12-arrow-1-2-0.md","title":"Arrow releases stable 1.2.0 version","description":"We\'re excited to announce the stable Arrow 1.2.0 version. To briefly summarize, this release:","date":"2023-07-12T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.32,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow releases stable 1.2.0 version","image":"https://xebia.com/wp-content/uploads/2023/04/arrow-release-ftr.jpg","category":"articles","tags":["core","articles"],"link":"https://xebia.com/blog/a-new-module-for-typed-errors-in-arrow-1-2-0/"},"unlisted":false,"prevItem":{"title":"Arrow 1.2.3 release","permalink":"/community/blog/2024/02/28/arrow-1-2-3"},"nextItem":{"title":"Arrow 2.0\'s Trajectory - Video","permalink":"/community/blog/2023/05/04/arrow-trajectory-kotlinconf"}},"content":"We\'re excited to announce the stable Arrow 1.2.0 version. To briefly summarize, this release:\\n\\n- Improves the API for [typed errors](http://arrow-kt.io/learn/typed-errors/working-with-typed-errors/),\\n including [`withError`](https://apidocs.arrow-kt.io/arrow-core/arrow.core.raise/with-error.html)\\n and [`merge`](https://apidocs.arrow-kt.io/arrow-core/arrow.core.raise/merge.html).\\n- Adds [`NonEmptyCollection`](https://apidocs.arrow-kt.io/arrow-core/arrow.core/-non-empty-collection/index.html)\\n as common parent of [`NonEmptyList`](https://apidocs.arrow-kt.io/arrow-core/arrow.core/-non-empty-list/index.html)\\n and [`NonEmptySet`](https://apidocs.arrow-kt.io/arrow-core/arrow.core/-non-empty-set/index.html).\\n- Introduces [`arrow-core-serialization`](https://arrow-kt.io/learn/quickstart/serialization/)\\n to be used alongside KotlinX Serialization.\\n- Fixes a few issues found in the Release Candidate.\\n\\nRead more details in the full [Arrow 1.2.0 release announcement](https://xebia.com/blog/a-new-module-for-typed-errors-in-arrow-1-2-0/)."},{"id":"/2023/05/04/arrow-trajectory-kotlinconf","metadata":{"permalink":"/community/blog/2023/05/04/arrow-trajectory-kotlinconf","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-05-04-arrow-trajectory-kotlinconf.md","source":"@site/content/blog/2023-05-04-arrow-trajectory-kotlinconf.md","title":"Arrow 2.0\'s Trajectory - Video","description":"Watch Simon Vergauwen\'s presentation from KotlinConf 2023 about the history of Arrow, and the trajectory for Arrow 2.0.","date":"2023-05-04T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.09,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 2.0\'s Trajectory - Video","image":"https://img.youtube.com/vi/tplA17M9Y4Q/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/tplA17M9Y4Q","event":"KotlinConf"},"unlisted":false,"prevItem":{"title":"Arrow releases stable 1.2.0 version","permalink":"/community/blog/2023/07/12/arrow-1-2-0"},"nextItem":{"title":"Nicer data transformation with KopyKat and Optics","permalink":"/community/blog/2023/05/04/data-transformation-kotlinconf"}},"content":"Watch [Simon Vergauwen](https://twitter.com/vergauwen_simon)\'s presentation from KotlinConf 2023 about the history of Arrow, and the trajectory for Arrow 2.0."},{"id":"/2023/05/04/data-transformation-kotlinconf","metadata":{"permalink":"/community/blog/2023/05/04/data-transformation-kotlinconf","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-05-04-data-transformation-kotlinconf.md","source":"@site/content/blog/2023-05-04-data-transformation-kotlinconf.md","title":"Nicer data transformation with KopyKat and Optics","description":"Watch Alejandro Serrano\'s presentation from KotlinConf 2023 about data transformation.","date":"2023-05-04T00:00:00.000Z","tags":[{"label":"optics","permalink":"/community/blog/tags/optics"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.365,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Nicer data transformation with KopyKat and Optics","image":"https://img.youtube.com/vi/atV8liVgd3w/maxresdefault.jpg","category":"videos","tags":["optics","videos"],"link":"https://youtu.be/atV8liVgd3w","event":"KotlinConf"},"unlisted":false,"prevItem":{"title":"Arrow 2.0\'s Trajectory - Video","permalink":"/community/blog/2023/05/04/arrow-trajectory-kotlinconf"},"nextItem":{"title":"Typed Error Handling in Kotlin","permalink":"/community/blog/2023/04/17/typed-error-handling-in-kotlin"}},"content":"Watch [Alejandro Serrano](https://twitter.com/trupill)\'s presentation from KotlinConf 2023 about data transformation.\\n\\nData classes are incredibly useful when modeling our domain in an immutable way. The Kotlin compiler gives us many niceties, including \'copy\' to create a new value based on a previous one. However, this \'copy\' often falls short. This talk explores two alternatives: KopyKat, a plug-in to generate additional variations of \'copy\', and Arrow Optics, a whole framework to transform this immutable data."},{"id":"/2023/04/17/typed-error-handling-in-kotlin","metadata":{"permalink":"/community/blog/2023/04/17/typed-error-handling-in-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-04-17-typed-error-handling-in-kotlin.md","source":"@site/content/blog/2023-04-17-typed-error-handling-in-kotlin.md","title":"Typed Error Handling in Kotlin","description":"A comparative study about several typed-error handling practices in Kotlin.","date":"2023-04-17T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.585,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Typed Error Handling in Kotlin","image":"https://miro.medium.com/v2/resize:fit:4800/0*kOFUN-7oR7gyGXu_","category":"articles","tags":["core","articles"],"link":"https://medium.com/@mitchellyuwono/typed-error-handling-in-kotlin-11ff25882880"},"unlisted":false,"prevItem":{"title":"Nicer data transformation with KopyKat and Optics","permalink":"/community/blog/2023/05/04/data-transformation-kotlinconf"},"nextItem":{"title":"Arrow 2.0\'s Trajectory","permalink":"/community/blog/2023/04/16/arrow-2-0-trajectory"}},"content":"A comparative study about several typed-error handling practices in Kotlin.\\n\\nThere are various approaches to error handling in the Kotlin community. \\nIn this article we\u2019ve explored a small subset of typed error handling practices in the community. \\n\\nFrom the approaches explored, there were three patterns that aligns with Kotlin recommendation with \\nrelatively low cognitive complexity including: Sealed class matching with early returns, Arrow\'s `either { }` builder, \\nand Arrow\'s `context(Raise)` with context-receivers. \\n\\nArrow\'s `context(Raise)` achieved the most optimized score on all aspects of \\ndeveloper productivity. This includes having the lowest cognitive complexity, the lowest cyclomatic complexity \\nas well as the most succinct with the least lines of codes.\\n\\nRead the full article: [Typed Error Handling in Kotlin](https://medium.com/@mitchellyuwono/typed-error-handling-in-kotlin-11ff25882880)."},{"id":"/2023/04/16/arrow-2-0-trajectory","metadata":{"permalink":"/community/blog/2023/04/16/arrow-2-0-trajectory","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-04-16-arrow-2-0-trajectory.md","source":"@site/content/blog/2023-04-16-arrow-2-0-trajectory.md","title":"Arrow 2.0\'s Trajectory","description":"A full transcript and the slides from Simon Vergauwen\'s presentation from KotlinConf 2023 about the history of Arrow and where it\'s going.","date":"2023-04-16T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"slidedecks","permalink":"/community/blog/tags/slidedecks"}],"readingTime":0.11,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow 2.0\'s Trajectory","image":"https://nomisrev.github.io/assets/KotlinConf%20-%20Arrow\'s%202.0%20Trajectory/KotlinConf%20-%20Arrow\'s%202.0%20Trajectory%20-%20Simon.001.png","category":"slidedecks","tags":["core","slidedecks"],"link":"https://nomisrev.github.io/arrows-2-0-trajectory/","event":"Kotlin Conf"},"unlisted":false,"prevItem":{"title":"Typed Error Handling in Kotlin","permalink":"/community/blog/2023/04/17/typed-error-handling-in-kotlin"},"nextItem":{"title":"Arrow 1.2.0-RC Release Summary","permalink":"/community/blog/2023/04/04/arrow-1-2-0-rc-summary"}},"content":"A full transcript and the slides from [Simon Vergauwen\'s](https://twitter.com/vergauwen_simon) presentation from KotlinConf 2023 about the history of Arrow and where it\'s going."},{"id":"/2023/04/04/arrow-1-2-0-rc-summary","metadata":{"permalink":"/community/blog/2023/04/04/arrow-1-2-0-rc-summary","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-04-04-arrow-1-2-0-rc-summary.md","source":"@site/content/blog/2023-04-04-arrow-1-2-0-rc-summary.md","title":"Arrow 1.2.0-RC Release Summary","description":"We\'re excited to announce Arrow 1.2.0-RC alongside a new Arrow website. 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To briefly summarize, this release:\\n\\n- Introduces a brand new [typed errors](http://arrow-kt.io/learn/typed-errors/working-with-typed-errors/) module.\\n- Adds more options for [resilience](http://arrow-kt.io/learn/resilience/).\\n- Marks every function and type we intend to remove in 2.0 as `@Deprecated`.\\n\\nRead more details in the full [Arrow 1.2.0 release announcement](https://xebia.com/blog/arrow-1-2-0-rc-is-now-available/)."},{"id":"/2023/02/04/functional-fun-kotlin","metadata":{"permalink":"/community/blog/2023/02/04/functional-fun-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-02-04-functional-fun-kotlin.md","source":"@site/content/blog/2023-02-04-functional-fun-kotlin.md","title":"Functional Fun in Kotlin","description":"Simon Vergauwen shares why he thinks Kotlin is great language to do modern functional programming, and why he believes it\'s perhaps the best language to do modern mainstream (hardcore) functional 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modern mainstream (hardcore) functional programming."},{"id":"/2023/01/03/codelytv-interview","metadata":{"permalink":"/community/blog/2023/01/03/codelytv-interview","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2023-01-03-codelytv-interview.md","source":"@site/content/blog/2023-01-03-codelytv-interview.md","title":"CodelyTV Interview with Raul Raja","description":"An interview with Arrow maintainer Ra\xfal Raja by Rafa G\xf3mez on CodelyTV.","date":"2023-01-03T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.06,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"CodelyTV Interview with Raul Raja","image":"https://img.youtube.com/vi/8WdprhzmQe4/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/8WdprhzmQe4"},"unlisted":false,"prevItem":{"title":"Functional Fun in 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receivers."},{"id":"/2022/12/01/functional-error-handling","metadata":{"permalink":"/community/blog/2022/12/01/functional-error-handling","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-functional-error-handling.md","source":"@site/content/blog/2022-12-01-functional-error-handling.md","title":"Functional Error Handling - A Practical Approach","description":"A presentation by Bas de Groot at Advanced Kotlin Dev Day 2022.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.06,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Functional Error Handling - A Practical Approach","image":"https://img.youtube.com/vi/T04ynq2IVFs/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/T04ynq2IVFs"},"unlisted":false,"prevItem":{"title":"Context Receivers: Kotlin\'s new secret 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way."},{"id":"/2022/12/01/graceful-shutdown-structured-concurrency","metadata":{"permalink":"/community/blog/2022/12/01/graceful-shutdown-structured-concurrency","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2022-12-01-graceful-shutdown-structured-concurrency.md","source":"@site/content/blog/2022-12-01-graceful-shutdown-structured-concurrency.md","title":"Graceful Shutdown with Structured Concurrency","description":"A presentation by Simon Vergauwen at Advanced Kotlin Dev Day 2022.","date":"2022-12-01T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.055,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Graceful Shutdown with Structured 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Indeed, the package of ready-to-use higher-level abstractions delivered by Arrow has proven so useful that our teams now consider Arrow a sensible default when working with Kotlin. Recently, in preparation for the 1.0 release, the Arrow team introduced several changes, including the addition of new modules but also some deprecations and removals."},{"id":"/2020/10/28/modifying-kotlin-nested-data-classes","metadata":{"permalink":"/community/blog/2020/10/28/modifying-kotlin-nested-data-classes","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-10-28-modifying-kotlin-nested-data-classes.md","source":"@site/content/blog/2020-10-28-modifying-kotlin-nested-data-classes.md","title":"How to fix the pain of modifying Kotlin nested data classes","description":"Lenses are not part of the Kotlin Standard Library yet, so we will need to use an Open Source library called Arrow-kt. 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Avoir un domaine auto-portant et non coupl\xe9 \xe0 des blocs techniques comme Spring (ou autres) apporte beaucoup dans la testabilit\xe9 et l\'\xe9volutivit\xe9 de l\'application.\\nLes mod\xe8les d\'asynchronismes (programmation r\xe9active, retard\xe9e, coroutines...) emp\xeachent la dissociation stricte de notre mod\xe8le m\xe9tier et de notre code infra dans un langage comme Kotlin.\\nOblig\xe9 d\'utiliser une lib de coroutine ou autre programmation reactive.\\nDeux solutions s\'offrent alors :\\n- D\xe9finir que les mod\xe8les d\'asynchronisme sont des invariants de notre domaine et accepter ce couplage\\n- Chercher comment mod\xe9liser notre domaine comme un ensemble de comportements asynchrones\\nDans ce talk nous allons voir comment r\xe9aliser la deuxi\xe8me solution en utilisant la librairie Arrow et son mod\xe8le conceptuel d\'asynchronisme pour nous permettre de d\xe9coupler notre domaine de toute logique 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He\'ll look at managing state changes, composing functions as well as some of the gotchas and wishes for the future.\\n\\nAlberto Ballano - Senior Software Engineer @47deg\\nAndroid architectures with Arrow Fx\\n\\nAlberto will talk about typical Android architectures, and how can they benefit from Functional Programming techniques available in Arrow."},{"id":"/2020/04/08/writing-compiler-plugin-with-with-arrow-meta","metadata":{"permalink":"/community/blog/2020/04/08/writing-compiler-plugin-with-with-arrow-meta","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-04-08-writing-compiler-plugin-with-with-arrow-meta.md","source":"@site/content/blog/2020-04-08-writing-compiler-plugin-with-with-arrow-meta.md","title":"Writing a Kotlin Compiler Plugin with Arrow Meta","description":"Learn how to write and test the debuglog compiler plugin in Arrow Meta. 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Here is the compiler plugin [debulog-arrow-meta](https://github.com/msya/debuglog-arrow-meta) explained in the article."},{"id":"/2020/04/06/template-oriented-programming-talk","metadata":{"permalink":"/community/blog/2020/04/06/template-oriented-programming-talk","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-04-06-template-oriented-programming-talk.md","source":"@site/content/blog/2020-04-06-template-oriented-programming-talk.md","title":"Template-Oriented-Programming to Ship Faster, Part-1","description":"Learn about the magic of Ad-hoc polymorphism using Arrow typeclasses with simple examples.","date":"2020-04-06T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.065,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Template-Oriented-Programming to Ship Faster, Part-1","image":"https://img.youtube.com/vi/_QBlKtUY6ac/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://youtu.be/_QBlKtUY6ac","event":"Kotlin User Group, Hyderabad, Online Meetup"},"unlisted":false,"prevItem":{"title":"Writing a Kotlin Compiler Plugin with Arrow Meta","permalink":"/community/blog/2020/04/08/writing-compiler-plugin-with-with-arrow-meta"},"nextItem":{"title":"Template-Oriented-Programming to Ship Faster","permalink":"/community/blog/2020/04/06/template-oriented-programming"}},"content":"Learn about the magic of Ad-hoc polymorphism using Arrow typeclasses with simple examples."},{"id":"/2020/04/06/template-oriented-programming","metadata":{"permalink":"/community/blog/2020/04/06/template-oriented-programming","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2020-04-06-template-oriented-programming.md","source":"@site/content/blog/2020-04-06-template-oriented-programming.md","title":"Template-Oriented-Programming to Ship Faster","description":"With a POC using Spring-fu + Kotlin + Arrow, let\'s Convert Monomorphic code (for common use-cases such as Auth, Validation) to Polymorphic reusable templates, to be reused among heterogeneous services built on different tech-stacks (blocking/non-blocking). This helps accelerate feature development.","date":"2020-04-06T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.2,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Template-Oriented-Programming to Ship Faster","image":"https://img.youtube.com/vi/_QBlKtUY6ac/maxresdefault.jpg","category":"articles","tags":["core","articles"],"link":"https://overfullstack.github.io/posts/top-with-ad-hoc-polymorphism/"},"unlisted":false,"prevItem":{"title":"Template-Oriented-Programming to Ship Faster, Part-1","permalink":"/community/blog/2020/04/06/template-oriented-programming-talk"},"nextItem":{"title":"Explaining the Arrow Android sample","permalink":"/community/blog/2020/04/01/explaining-arrow-android-sample"}},"content":"With a POC using Spring-fu + Kotlin + Arrow, let\'s Convert Monomorphic code (for common use-cases such as Auth, Validation) to Polymorphic reusable templates, to be reused among heterogeneous services built on different tech-stacks (blocking/non-blocking). 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You can follow along the example in [this folder](https://github.com/arrow-kt/arrow/tree/master/modules/docs/arrow-examples/src/test/kotlin/arrow/typeclasses)."},{"id":"/2018/10/21/polyjokes","metadata":{"permalink":"/community/blog/2018/10/21/polyjokes","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2018-10-21-polyjokes.md","source":"@site/content/blog/2018-10-21-polyjokes.md","title":"Polyjokes\u200a - \u200aA polymorphic approach using Arrow","description":"@dcampogiani is using a polymorphic approach to retrieve a random user and then a joke about him.","date":"2018-10-21T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"articles","permalink":"/community/blog/tags/articles"}],"readingTime":0.11,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Polyjokes\u200a - \u200aA polymorphic approach using Arrow","image":"/img/blog-image-header.png","category":"articles","tags":["core","articles"],"link":"https://github.com/dcampogiani/polyjokes"},"unlisted":false,"prevItem":{"title":"Simple Dependency Management in Kotlin","permalink":"/community/blog/2018/11/07/simple-management-dependency"},"nextItem":{"title":"Architecting Typed FP Applications & Libraries in Kotlin with Arrow","permalink":"/community/blog/2018/10/05/kotlin-conf-fp-in-kotlin-with-arrow"}},"content":"[@dcampogiani](https://github.com/dcampogiani) is using a polymorphic approach to retrieve a random user and then a joke about him.\\n\\n[Polyjokes\u200a\u2014\u200aA polymorphic approach using Arrow](https://github.com/dcampogiani/polyjokes)"},{"id":"/2018/10/05/kotlin-conf-fp-in-kotlin-with-arrow","metadata":{"permalink":"/community/blog/2018/10/05/kotlin-conf-fp-in-kotlin-with-arrow","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2018-10-05-kotlin-conf-fp-in-kotlin-with-arrow.md","source":"@site/content/blog/2018-10-05-kotlin-conf-fp-in-kotlin-with-arrow.md","title":"Architecting Typed FP Applications & Libraries in Kotlin with Arrow","description":"This talk includes a comprehensive walkthrough of the most important patterns covered by the data types and type classes we find in Arrow. 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Each pattern will be accompanied by code examples that illustrate how Arrow brings Typed Functional Programming to Kotlin.\\n\\n[Sources and slides](https://github.com/47deg/arrow-architecture)"},{"id":"/2018/07/24/arrow-fp-kotlin","metadata":{"permalink":"/community/blog/2018/07/24/arrow-fp-kotlin","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2018-07-24-arrow-fp-kotlin.md","source":"@site/content/blog/2018-07-24-arrow-fp-kotlin.md","title":"Arrow and Functional Programming for Kotlin Developers","description":"A beginner level introduction to Functional Programming for Kotlin and/or Android Developers or developers with OOP background.","date":"2018-07-24T00:00:00.000Z","tags":[{"label":"core","permalink":"/community/blog/tags/core"},{"label":"videos","permalink":"/community/blog/tags/videos"}],"readingTime":0.085,"hasTruncateMarker":false,"authors":[],"frontMatter":{"title":"Arrow and Functional Programming for Kotlin Developers","image":"https://img.youtube.com/vi/qYgilPqMOp0/maxresdefault.jpg","category":"videos","tags":["core","videos"],"link":"https://www.youtube.com/watch?v=qYgilPqMOp0","event":"DroidJam India, Bangalore, India"},"unlisted":false,"prevItem":{"title":"Architecting Typed FP Applications & Libraries in Kotlin with Arrow","permalink":"/community/blog/2018/10/05/kotlin-conf-fp-in-kotlin-with-arrow"},"nextItem":{"title":"Functional Programming in Kotlin with Arrow by Emmanuel Nhan","permalink":"/community/blog/2018/06/27/fp-kotlin-arrow"}},"content":"A beginner level introduction to Functional Programming for Kotlin and/or Android Developers or developers with OOP background."},{"id":"/2018/06/27/fp-kotlin-arrow","metadata":{"permalink":"/community/blog/2018/06/27/fp-kotlin-arrow","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2018-06-27-fp-kotlin-arrow.md","source":"@site/content/blog/2018-06-27-fp-kotlin-arrow.md","title":"Functional Programming in Kotlin with Arrow by Emmanuel Nhan","description":"@nhanmanu introduces Kotlin and how it is a good fit for functional programming. 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The talk goes through some interesting features of Kotlin, then show how to use them to enter the world of Higher Kinds and Typeclasses. 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Programming architectures from scratch\\n\\n[Kotlin Functional Programming: Does it make sense?](https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-does-it-make-sense-36ad07e6bacf)\\n\\n[Kotlin Functional Programming I: Monad Stack](https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-i-monad-stack-518d1bd8fbee)\\n\\n[Kotlin Functional Programming II: Monad Transformers](https://medium.com/@JorgeCastilloPr/kotlin-functional-programming-ii-monad-transformers-b1f020f14dd8)"},{"id":"/2017/10/20/functional-approach","metadata":{"permalink":"/community/blog/2017/10/20/functional-approach","editUrl":"https://github.com/arrow-kt/arrow-website/edit/main/content/blog/2017-10-20-functional-approach.md","source":"@site/content/blog/2017-10-20-functional-approach.md","title":"Functional approach to Android architecture using Kotlin","description":"Move side effects to the edges of the system, implement a functional oriented architecture for Android apps based on 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t.source}))),lookbehind:!0,inside:{punctuation:/\./}}})}(Prism)},32334:()=>{!function(e){e.languages.kotlin=e.languages.extend("clike",{keyword:{pattern:/(^|[^.])\b(?:abstract|actual|annotation|as|break|by|catch|class|companion|const|constructor|continue|crossinline|data|do|dynamic|else|enum|expect|external|final|finally|for|fun|get|if|import|in|infix|init|inline|inner|interface|internal|is|lateinit|noinline|null|object|open|operator|out|override|package|private|protected|public|reified|return|sealed|set|super|suspend|tailrec|this|throw|to|try|typealias|val|var|vararg|when|where|while)\b/,lookbehind:!0},function:[{pattern:/(?:`[^\r\n`]+`|\b\w+)(?=\s*\()/,greedy:!0},{pattern:/(\.)(?:`[^\r\n`]+`|\w+)(?=\s*\{)/,lookbehind:!0,greedy:!0}],number:/\b(?:0[xX][\da-fA-F]+(?:_[\da-fA-F]+)*|0[bB][01]+(?:_[01]+)*|\d+(?:_\d+)*(?:\.\d+(?:_\d+)*)?(?:[eE][+-]?\d+(?:_\d+)*)?[fFL]?)\b/,operator:/\+[+=]?|-[-=>]?|==?=?|!(?:!|==?)?|[\/*%<>]=?|[?:]:?|\.\.|&&|\|\||\b(?:and|inv|or|shl|shr|ushr|xor)\b/}),delete e.languages.kotlin["class-name"];var t={"interpolation-punctuation":{pattern:/^\$\{?|\}$/,alias:"punctuation"},expression:{pattern:/[\s\S]+/,inside:e.languages.kotlin}};e.languages.insertBefore("kotlin","string",{"string-literal":[{pattern:/"""(?:[^$]|\$(?:(?!\{)|\{[^{}]*\}))*?"""/,alias:"multiline",inside:{interpolation:{pattern:/\$(?:[a-z_]\w*|\{[^{}]*\})/i,inside:t},string:/[\s\S]+/}},{pattern:/"(?:[^"\\\r\n$]|\\.|\$(?:(?!\{)|\{[^{}]*\}))*"/,alias:"singleline",inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\$(?:[a-z_]\w*|\{[^{}]*\})/i,lookbehind:!0,inside:t},string:/[\s\S]+/}}],char:{pattern:/'(?:[^'\\\r\n]|\\(?:.|u[a-fA-F0-9]{0,4}))'/,greedy:!0}}),delete e.languages.kotlin.string,e.languages.insertBefore("kotlin","keyword",{annotation:{pattern:/\B@(?:\w+:)?(?:[A-Z]\w*|\[[^\]]+\])/,alias:"builtin"}}),e.languages.insertBefore("kotlin","function",{label:{pattern:/\b\w+@|@\w+\b/,alias:"symbol"}}),e.languages.kt=e.languages.kotlin,e.languages.kts=e.languages.kotlin}(Prism)},96854:()=>{!function(e){function t(e,t){return"___"+e.toUpperCase()+t+"___"}Object.defineProperties(e.languages["markup-templating"]={},{buildPlaceholders:{value:function(n,r,o,a){if(n.language===r){var i=n.tokenStack=[];n.code=n.code.replace(o,(function(e){if("function"==typeof a&&!a(e))return e;for(var o,s=i.length;-1!==n.code.indexOf(o=t(r,s));)++s;return i[s]=e,o})),n.grammar=e.languages.markup}}},tokenizePlaceholders:{value:function(n,r){if(n.language===r&&n.tokenStack){n.grammar=e.languages[r];var o=0,a=Object.keys(n.tokenStack);!function i(s){for(var c=0;c=a.length);c++){var l=s[c];if("string"==typeof l||l.content&&"string"==typeof l.content){var u=a[o],d=n.tokenStack[u],p="string"==typeof l?l:l.content,f=t(r,u),m=p.indexOf(f);if(m>-1){++o;var h=p.substring(0,m),g=new e.Token(r,e.tokenize(d,n.grammar),"language-"+r,d),b=p.substring(m+f.length),y=[];h&&y.push.apply(y,i([h])),y.push(g),b&&y.push.apply(y,i([b])),"string"==typeof l?s.splice.apply(s,[c,1].concat(y)):l.content=y}}else l.content&&i(l.content)}return s}(n.tokens)}}}})}(Prism)},12886:()=>{Prism.languages.scala=Prism.languages.extend("java",{"triple-quoted-string":{pattern:/"""[\s\S]*?"""/,greedy:!0,alias:"string"},string:{pattern:/("|')(?:\\.|(?!\1)[^\\\r\n])*\1/,greedy:!0},keyword:/<-|=>|\b(?:abstract|case|catch|class|def|derives|do|else|enum|extends|extension|final|finally|for|forSome|given|if|implicit|import|infix|inline|lazy|match|new|null|object|opaque|open|override|package|private|protected|return|sealed|self|super|this|throw|trait|transparent|try|type|using|val|var|while|with|yield)\b/,number:/\b0x(?:[\da-f]*\.)?[\da-f]+|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e\d+)?[dfl]?/i,builtin:/\b(?:Any|AnyRef|AnyVal|Boolean|Byte|Char|Double|Float|Int|Long|Nothing|Short|String|Unit)\b/,symbol:/'[^\d\s\\]\w*/}),Prism.languages.insertBefore("scala","triple-quoted-string",{"string-interpolation":{pattern:/\b[a-z]\w*(?:"""(?:[^$]|\$(?:[^{]|\{(?:[^{}]|\{[^{}]*\})*\}))*?"""|"(?:[^$"\r\n]|\$(?:[^{]|\{(?:[^{}]|\{[^{}]*\})*\}))*")/i,greedy:!0,inside:{id:{pattern:/^\w+/,greedy:!0,alias:"function"},escape:{pattern:/\\\$"|\$[$"]/,greedy:!0,alias:"symbol"},interpolation:{pattern:/\$(?:\w+|\{(?:[^{}]|\{[^{}]*\})*\})/,greedy:!0,inside:{punctuation:/^\$\{?|\}$/,expression:{pattern:/[\s\S]+/,inside:Prism.languages.scala}}},string:/[\s\S]+/}}}),delete Prism.languages.scala["class-name"],delete Prism.languages.scala.function,delete Prism.languages.scala.constant},20775:(e,t,n)=>{var r={"./prism-groovy":40485,"./prism-haskell":81295,"./prism-java":52503,"./prism-kotlin":32334,"./prism-scala":12886};function o(e){var t=a(e);return n(t)}function a(e){if(!n.o(r,e)){var t=new Error("Cannot find module '"+e+"'");throw t.code="MODULE_NOT_FOUND",t}return r[e]}o.keys=function(){return Object.keys(r)},o.resolve=a,e.exports=o,o.id=20775},92703:(e,t,n)=>{"use strict";var r=n(50414);function o(){}function a(){}a.resetWarningCache=o,e.exports=function(){function e(e,t,n,o,a,i){if(i!==r){var s=new Error("Calling PropTypes validators directly is not supported by the `prop-types` package. Use PropTypes.checkPropTypes() to call them. Read more at http://fb.me/use-check-prop-types");throw s.name="Invariant Violation",s}}function t(){return e}e.isRequired=e;var n={array:e,bigint:e,bool:e,func:e,number:e,object:e,string:e,symbol:e,any:e,arrayOf:t,element:e,elementType:e,instanceOf:t,node:e,objectOf:t,oneOf:t,oneOfType:t,shape:t,exact:t,checkPropTypes:a,resetWarningCache:o};return n.PropTypes=n,n}},45697:(e,t,n)=>{e.exports=n(92703)()},50414:e=>{"use strict";e.exports="SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED"},64448:(e,t,n)=>{"use strict";var r=n(67294),o=n(63840);function a(e){for(var t="https://reactjs.org/docs/error-decoder.html?invariant="+e,n=1;n