APIs week1

3-UsingAPIs/Week1/homework/ex1-johnWho.js

@@ -6,21 +6,28 @@ Rewrite this function, but replace the callback syntax with the Promise syntax:
 - If the Promise `rejects`, pass an error as the argument to reject with: "You 
   didn't pass in a first name!"
 ------------------------------------------------------------------------------*/
-// TODO see above
-const getAnonName = (firstName, callback) => {
-  setTimeout(() => {
-    if (!firstName) {
-      callback(new Error("You didn't pass in a first name!"));
-      return;
-    }
 
-    const fullName = `${firstName} Doe`;
+const getAnonName = (firstName) => {
+  const anonName = new Promise((resolve, reject) => {
+    setTimeout(() => {
+      if (firstName) {
+        resolve(`${firstName} Doe`);
+      } else {
+        reject(new Error("You didn't pass in a first name!"));
+      }
+    }, 1000);
+  });
+  return anonName;
+};
 
-    callback(fullName);
-  }, 1000);
+const handleSuccess = (resolvedValue) => {
+  console.log(resolvedValue);
+};
+const handleFailure = (rejectValue) => {
+  console.log(rejectValue);
 };
 
-getAnonName('John', console.log);
+getAnonName('John').then(handleSuccess).catch(handleFailure);
 
 // ! Do not change or remove the code below
 module.exports = getAnonName;

3-UsingAPIs/Week1/homework/ex2-checkDoubleDigits.js

@@ -10,8 +10,15 @@ Complete the function called `checkDoubleDigits` such that:
   "Expected a double digit number but got `number`", where `number` is the 
   number that was passed as an argument.
 ------------------------------------------------------------------------------*/
-function checkDoubleDigits(/* TODO add parameter(s) here */) {
-  // TODO complete this function
+function checkDoubleDigits(number) {
+  const checkNumber = new Promise((resolve, reject) => {
+    if (number >= 10 && number <= 99) {
+      resolve('This is double digit number!');
+    } else {
+      reject(new Error(`Expected a double digit number but got ${number}`));
+    }
+  });
+  return checkNumber;
 }
 
 checkDoubleDigits(11) // should resolve

3-UsingAPIs/Week1/homework/ex3-rollDice.js

@@ -9,47 +9,38 @@
   explanation? Add your answer as a comment to be bottom of the file.
 ------------------------------------------------------------------------------*/
 
-// TODO Remove callback and return a promise
-function rollDice(callback) {
-  // Compute a random number of rolls (3-10) that the dice MUST complete
-  const randomRollsToDo = Math.floor(Math.random() * 8) + 3;
-  console.log(`Dice scheduled for ${randomRollsToDo} rolls...`);
-
-  const rollOnce = (roll) => {
-    // Compute a random dice value for the current roll
-    const value = Math.floor(Math.random() * 6) + 1;
-    console.log(`Dice value is now: ${value}`);
-
-    // Use callback to notify that the dice rolled off the table after 6 rolls
-    if (roll > 6) {
-      // TODO replace "error" callback
-      callback(new Error('Oops... Dice rolled off the table.'));
-    }
-
-    // Use callback to communicate the final dice value once finished rolling
-    if (roll === randomRollsToDo) {
-      // TODO replace "success" callback
-      callback(null, value);
-    }
-
-    // Schedule the next roll todo until no more rolls to do
-    if (roll < randomRollsToDo) {
-      setTimeout(() => rollOnce(roll + 1), 500);
-    }
-  };
-
-  // Start the initial roll
-  rollOnce(1);
+function rollDice() {
+  const rollPromise = new Promise((resolve, reject) => {
+    // Compute a random number of rolls (3-10) that the dice MUST complete
+    const randomRollsToDo = Math.floor(Math.random() * 8) + 3;
+
+    console.log(`Dice scheduled for ${randomRollsToDo} rolls...`);
+    const rollOnce = (roll) => {
+      // Compute a random dice value for the current roll
+      const value = Math.floor(Math.random() * 6) + 1;
+      console.log(`Dice value is now: ${value}`);
+
+      if (roll > 6) {
+        reject(new Error('Oops... Dice rolled off the table.'));
+      }
+      if (roll === randomRollsToDo) {
+        resolve(`Success! Dice settled on ${value}.`);
+      }
+      if (roll < randomRollsToDo) {
+        setTimeout(() => rollOnce(roll + 1), 500);
+      }
+    };
+    // Start the initial roll
+    rollOnce(1);
+  });
+  return rollPromise;
 }
 
-// TODO Refactor to use promise
-rollDice((error, value) => {
-  if (error !== null) {
-    console.log(error.message);
-  } else {
-    console.log(`Success! Dice settled on ${value}.`);
-  }
-});
+rollDice()
+  .then((resolveValue) => console.log(resolveValue))
+  .catch((rejectValue) => console.log(rejectValue.message));
 
+// It looks like the promise gives the value (reject or resolve) immediately after
+// the first case (rejection or resolving) happen and doesn't change this value anymore.
 // ! Do not change or remove the code below
 module.exports = rollDice;

3-UsingAPIs/Week1/homework/ex4-pokerDiceAll.js

@@ -18,14 +18,19 @@ Can you explain why? Please add your answer as a comment to the end of the exerc
 const rollDice = require('../../helpers/pokerDiceRoller');
 
 function rollTheDices() {
-  // TODO Refactor this function
   const dices = [1, 2, 3, 4, 5];
-  return rollDice(1);
+  const resultPromises = dices.map((dice) => rollDice(dice));
+  return Promise.all(resultPromises);
 }
 
 rollTheDices()
   .then((results) => console.log('Resolved!', results))
   .catch((error) => console.log('Rejected!', error.message));
 
+//1. Dices that have not yet finished their roll continue to do so because  reject() doesn't mean 'return'.
+//2. There only a single call to either .then() or .catch() despite resolve() and/or reject() being called more than once
+//because .then() or .catch() can be called only ones. But I'm not sure :)
+//3. We get "Rejected! Dice ... rolled off the table." only once even if several dices rolled off the table
+//because if one of the promises is rejected the promise returned by Promise.all() is rejected.
 // ! Do not change or remove the code below
 module.export = rollTheDices;

3-UsingAPIs/Week1/homework/ex5-rollDiceChain.js

@@ -0,0 +1,25 @@
+// Challenge: throw five dices in sequence
+const rollDice = require('../../helpers/pokerDiceRoller');
+function rollTheDices() {
+  const results = [];
+
+  const pushAndRoll = (dice) => (value) => {
+    results.push(value);
+    return rollDice(dice);
+  };
+
+  rollDice(1)
+    .then(pushAndRoll(2))
+    .then(pushAndRoll(3))
+    .then(pushAndRoll(4))
+    .then(pushAndRoll(5))
+    .then((value) => {
+      results.push(value);
+      console.log('Resolved!', results);
+    })
+    .catch((error) => console.log('Rejected!', error.message));
+}
+
+rollTheDices();
+// ! Do not change or remove the code below
+module.exports = rollTheDices;

3-UsingAPIs/Week1/test-reports/ex1-johnWho.pass.txt

@@ -0,0 +1 @@
+All tests passed

3-UsingAPIs/Week1/test-reports/ex2-checkDoubleDigits.pass.txt

@@ -0,0 +1 @@
+All tests passed

3-UsingAPIs/Week1/test-reports/ex3-rollDice.pass.txt

@@ -0,0 +1 @@
+All tests passed

3-UsingAPIs/Week1/test-reports/ex4-pokerDiceAll.pass.txt

@@ -0,0 +1 @@
+All tests passed

3-UsingAPIs/Week1/test-reports/ex5-rollDiceChain.pass.txt

@@ -0,0 +1 @@
+All tests passed

sysinfo.json

@@ -0,0 +1,71 @@
+{
+  "node": "v14.15.4",
+  "system": {
+    "manufacturer": "Acer",
+    "model": "Aspire ES1-331"
+  },
+  "cpu": {
+    "manufacturer": "Intel®",
+    "brand": "Pentium® N3700",
+    "speed": 1.6
+  },
+  "memory": "8 GB",
+  "osInfo": {
+    "platform": "win32",
+    "distro": "�������� Windows 10 ������� ��� ������ �몠",
+    "release": "10.0.19042"
+  },
+  "blockDevices": [
+    {
+      "name": "C:",
+      "size": "499 GB",
+      "fsType": "ntfs",
+      "physical": "Local"
+    }
+  ],
+  "vscodeInfo": {
+    "version": "1.54.3",
+    "extensions": [
+      "aaron-bond.better-comments",
+      "bierner.github-markdown-preview",
+      "bierner.markdown-checkbox",
+      "bierner.markdown-emoji",
+      "bierner.markdown-preview-github-styles",
+      "bierner.markdown-yaml-preamble",
+      "CoenraadS.bracket-pair-colorizer",
+      "CoenraadS.bracket-pair-colorizer-2",
+      "DavidAnson.vscode-markdownlint",
+      "dbaeumer.vscode-eslint",
+      "eamodio.gitlens",
+      "esbenp.prettier-vscode",
+      "evgeniypeshkov.syntax-highlighter",
+      "formulahendry.code-runner",
+      "hdg.live-html-previewer",
+      "ritwickdey.LiveServer",
+      "streetsidesoftware.code-spell-checker",
+      "techer.open-in-browser",
+      "vsls-contrib.codetour"
+    ],
+    "userSettings": {
+      "editor.detectIndentation": false,
+      "editor.formatOnSave": true,
+      "editor.minimap.enabled": false,
+      "editor.renderIndentGuides": true,
+      "editor.tabSize": 2,
+      "editor.codeActionsOnSave": {
+        "source.fixAll": true
+      },
+      "eslint.autoFixOnSave": true,
+      "files.autoSave": "onFocusChange",
+      "prettier.singleQuote": true,
+      "prettier.trailingComma": "all",
+      "terminal.integrated.shell.windows": "C:\\Program Files\\Git\\bin\\bash.exe",
+      "workbench.colorTheme": "Visual Studio Light",
+      "[javascript]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+      },
+      "liveServer.settings.donotShowInfoMsg": true,
+      "window.zoomLevel": 1
+    }
+  }
+}

veroniqe@rambler.ru.log

@@ -0,0 +1,66 @@
+2021-03-19 01:33:45 info: ---------------------------------------
+2021-03-19 01:33:45 info: >>> Running Unit Test `ex1-johnWho` <<<
+2021-03-19 01:33:45 info: ---------------------------------------
+2021-03-19 01:34:42 error: *** Unit Test Error Report ***
+
+- getAnonName should return a resolved promise when called with a string argument
+  Expected: John Doe
+  Received: John
+
+2021-03-19 01:36:22 info: ---------------------------------------
+2021-03-19 01:36:22 info: >>> Running Unit Test `ex1-johnWho` <<<
+2021-03-19 01:36:22 info: ---------------------------------------
+2021-03-19 01:36:40 info: All unit tests passed.
+2021-03-19 01:36:52 info: All steps were completed successfully
+2021-03-19 02:47:53 info: -------------------------------------------------
+2021-03-19 02:47:53 info: >>> Running Unit Test `ex2-checkDoubleDigits` <<<
+2021-03-19 02:47:53 info: -------------------------------------------------
+2021-03-19 02:48:58 info: All unit tests passed.
+2021-03-19 02:49:18 info: All steps were completed successfully
+2021-03-19 06:36:05 info: ----------------------------------------
+2021-03-19 06:36:05 info: >>> Running Unit Test `ex3-rollDice` <<<
+2021-03-19 06:36:05 info: ----------------------------------------
+2021-03-19 06:36:23 info: All unit tests passed.
+2021-03-19 06:36:38 info: All steps were completed successfully
+2021-03-19 07:37:15 info: ----------------------------------------
+2021-03-19 07:37:15 info: >>> Running Unit Test `ex3-rollDice` <<<
+2021-03-19 07:37:15 info: ----------------------------------------
+2021-03-19 07:37:31 info: All unit tests passed.
+2021-03-19 07:37:44 info: All steps were completed successfully
+2021-03-20 02:01:16 info: ----------------------------------------
+2021-03-20 02:01:16 info: >>> Running Unit Test `ex3-rollDice` <<<
+2021-03-20 02:01:16 info: ----------------------------------------
+2021-03-20 02:01:51 info: All unit tests passed.
+2021-03-20 02:01:57 error: *** ESLint Report ***
+
+ex3-rollDice.js
+  15:5  warning  Remove commented-out code  hyf/no-commented-out-code
+
+✖ 1 problem (0 errors, 1 warning)
+
+
+2021-03-20 02:03:47 info: ----------------------------------------
+2021-03-20 02:03:47 info: >>> Running Unit Test `ex3-rollDice` <<<
+2021-03-20 02:03:47 info: ----------------------------------------
+2021-03-20 02:04:03 info: All unit tests passed.
+2021-03-20 02:04:17 info: All steps were completed successfully
+2021-03-20 02:06:17 info: ----------------------------------------
+2021-03-20 02:06:17 info: >>> Running Unit Test `ex3-rollDice` <<<
+2021-03-20 02:06:17 info: ----------------------------------------
+2021-03-20 02:06:33 info: All unit tests passed.
+2021-03-20 02:06:54 info: All steps were completed successfully
+2021-03-20 03:55:45 info: --------------------------------------------
+2021-03-20 03:55:45 info: >>> Running Unit Test `ex4-pokerDiceAll` <<<
+2021-03-20 03:55:45 info: --------------------------------------------
+2021-03-20 03:56:02 info: All unit tests passed.
+2021-03-20 03:56:15 info: All steps were completed successfully
+2021-03-22 02:12:27 info: ---------------------------------------------
+2021-03-22 02:12:27 info: >>> Running Unit Test `ex5-rollDiceChain` <<<
+2021-03-22 02:12:27 info: ---------------------------------------------
+2021-03-22 02:12:27 warn: A unit test file was not provided.
+2021-03-22 02:12:46 info: All steps were completed successfully
+2021-03-25 04:14:43 info: --------------------------------------------
+2021-03-25 04:14:43 info: >>> Running Unit Test `ex4-pokerDiceAll` <<<
+2021-03-25 04:14:43 info: --------------------------------------------
+2021-03-25 04:15:38 info: All unit tests passed.
+2021-03-25 04:15:56 info: All steps were completed successfully