A library of zero-dependency npm modules that do just do one thing. Guilt-free utilities for every occasion.
Editable, runnable examples of every utility (powered by RunKit)
The Zen of Dependency-Free –- Why I wrote Just
npm install just-compare
import compare from 'just-compare';
// primitives: value1 === value2
// functions: value1.toString == value2.toString
// arrays: if length, sequence and values of properties are identical
// objects: if length, names and values of properties are identical
compare([[1, [2, 3]], [[1, [2, 3]]); // true
compare([[1, [2, 3], 4], [[1, [2, 3]]); // false
compare({a: 2, b: 3}, {a: 2, b: 3}); // true
compare({a: 2, b: 3}, {b: 3, a: 2}); // true
compare({a: 2, b: 3, c: 4}, {a: 2, b: 3}); // false
compare({a: 2, b: 3}, {a: 2, b: 3, c: 4}); // false
compare([[1, [2, {a: 4}], 4], [[1, [2, {a: 4}]]); // truenpm install just-pluck-it
import pluck from 'just-pluck-it';
pluck([{a:1, b:2}, {a:4, b:3}, {a:2, b:5}], 'a'); // [1, 4, 2]
pluck({x: {a:1, b:2}, y: {a:4, b:3}, z: {a:2, b:5}}, 'a'); // {x: 1, y: 4, z: 2}npm install just-flush
import flush from 'just-flush';
flush([1, undefined, 2, null, 3, NaN, 0]); // [1, 2, 3, NaN, 0]
flush([true, null, false, true, [null], undefined]); // [true, false, [null], true]
flush({a: 2, b: null, c: 4, d: undefined}); // {a: 2, c: 4}
flush('something'); // undefined
flush(); // undefinednpm install just-extend
import extend from 'just-extend';
let obj = {a: 3, b: 5};
extend(obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
obj; // {a: 4, b: 5, c: 8}
let obj = {a: 3, b: 5};
extend({}, obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
obj; // {a: 3, b: 5}
let arr = [1, 2, 3];
let obj = {a: 3, b: 5};
extend(obj, {c: arr}); // {a: 3, b: 5, c: [1, 2, 3]}
arr.push[4];
obj; // {a: 3, b: 5, c: [1, 2, 3, 4]}
let arr = [1, 2, 3];
let obj = {a: 3, b: 5};
extend(true, obj, {c: arr}); // {a: 3, b: 5, c: [1, 2, 3]}
arr.push[4];
obj; // {a: 3, b: 5, c: [1, 2, 3]}npm install just-values
import values from 'just-values';
values({a: 4, c: 8}); // [4, 8]
values({a: {aa: 2}, b: {bb: 4}}); // [{aa: 2}, {bb: 4}]
values({}); // []
values([1, 2, 3]); // [1, 2, 3]
values(function(a, b) {return a + b;}); // []
values(String('hello')); // []
values(1); // throw exception
values(true); // throw exception
values(undefined); // throw exception
values(null); // throw exceptionnpm install just-pick
import pick from 'just-pick';
var obj = {a: 3, b: 5, c: 9};
pick(obj, ['a', 'c']); // {a: 3, c: 9}
pick(obj, 'a', 'c'); // {a: 3, c: 9}
pick(obj, ['a', 'b', 'd']); // {a: 3, b: 5, d: undefined}
pick(obj, ['a', 'a']); // {a: 3}npm install just-omit
import omit from 'just-omit';
var obj = {a: 3, b: 5, c: 9};
omit(obj, ['a', 'c']); // {b: 5}
omit(obj, 'a', 'c'); // {b: 5}
omit(obj, ['a', 'b', 'd']); // {c: 9}
omit(obj, ['a', 'a']); // {b: 5, c: 9}npm install just-is-empty
import isEmpty from 'just-is-empty';
isEmpty({a: 3, b: 5}) // false
isEmpty(['a','b']) // false
isEmpty({}) // true
isEmpty([]) // true
isEmpty(null) // true
isEmpty(undefined) // truenpm install just-is-circular
import isCircular from 'just-is-circular';
const a = {};
a.b = a;
isCircular(a) // true
const a = {};
a.b = {c: a}
isCircular(a) // true
const a = {};
a.b = {c: 4}
isCircular(a) // false
const a = [];
a.push(a);
isCircular(a) // true
isCircular({}) // false
isCircular('hi') // false
isCircular(undefined) // falsenpm install just-is-primitive
import isPrimitive from 'just-is-primitive';
isPrimitive('hi') // true
isPrimitive(3) // true
isPrimitive(true) // true
isPrimitive(false) // true
isPrimitive(null) // true
isPrimitive(undefined) // true
isPrimitive(Symbol()) // true
isPrimitive({}) // false
isPrimitive([]) // false
isPrimitive(function() {}) // false
isPrimitive(new Date()) // false
isPrimitive(/a/) // falsenpm install just-filter-object
import filter from 'just-filter-object';
// returns a new object containing those original properties for which the predicate returns truthy
filter({a: 3, b: 5, c: 9}, (key, value) => value < 6); // {a: 3, b: 5}
filter({a1: 3, b1: 5, a2: 9}, (key, value) => key[0] == 'a'); // {a1: 3, a2: 9}
filter({a: 3, b: 5, c: null}, (key, value) => value); // {a: 3, b: 5}npm install just-map-object
import map from 'just-map-object';
// returns a new object with the predicate applied to each value
map({a: 3, b: 5, c: 9}, (key, value) => value + 1); // {a: 4, b: 6, c: 10}
map({a: 3, b: 5, c: 9}, (key, value) => key); // {a: 'a', b: 'b', c: 'c'}
map({a: 3, b: 5, c: 9}, (key, value) => key + value); // {a: 'a3', b: 'b5', c: 'c9'}npm install just-reduce-object
import reduce from 'just-reduce-object';
// applies a function against an accumulator and each key-value pairs of the object
// to reduce it to a single value
reduce({a: 3, b: 5, c: 9}, (acc, key, value, index, keys) => {
acc[value] = key;
return acc;
}, {}); // {3: 'a', 5: 'b', 9: 'c'}
reduce({a: 3, b: 5, c: 9}, (acc, key, value, index, keys) => {
acc += value;
return acc;
}); // 17npm install just-safe-get
import get from 'just-safe-get';
const obj = {a: {aa: {aaa: 2}}, b: 4};
get(obj, 'a.aa.aaa'); // 2
get(obj, ['a', 'aa', 'aaa']); // 2
get(obj, 'b.bb.bbb'); // undefined
get(obj, ['b', 'bb', 'bbb']); // undefined
get(obj.a, 'aa.aaa'); // 2
get(obj.a, ['aa', 'aaa']); // 2
get(obj.b, 'bb.bbb'); // undefined
get(obj.b, ['bb', 'bbb']); // undefinednpm install just-safe-set
import set from 'just-safe-set';
const obj1 = {};
set(obj1, 'a.aa.aaa', 4}); // true
obj1; // {a: {aa: {aaa: 4}}}
const obj2 = {};
set(obj2, [a, aa, aaa], 4}); // true
obj2; // {a: {aa: {aaa: 4}}}
const obj3 = {a: {aa: {aaa: 2}}};
set(obj3, 'a.aa.aaa', 3); // true
obj3; // {a: {aa: {aaa: 3}}}
const obj4 = {a: {aa: {aaa: 2}}};
set(obj4, 'a.aa', {bbb: 7}); // true
obj4; // {a: {aa: {bbb: 7}}}npm install just-typeof
import typeOf from 'just-typeof';
typeOf({}); // 'object'
typeOf([]); // 'array'
typeOf(function() {}); // 'function'
typeOf(/a/); // 'regexp'
typeOf(new Date()); // 'date'
typeOf(null); // 'null'
typeOf(undefined); // 'undefined'
typeOf('a'); // 'string'
typeOf(1); // 'number'
typeOf(true); // 'boolean'npm install just-flip-object
import flip from 'just-flip-object';
// flip the key and value
flip({a: 'x', b: 'y', c: 'z'}); // {x: 'a', y: 'b', z: 'c'}
flip({a: 1, b: 2, c: 3}); // {'1': 'a', '2': 'b', '3': 'c'}
flip({a: false, b: true}); // {false: 'a', true: 'b'}npm install just-unique
import unique from 'just-unique';
unique([1, 2, 3, 2, 3, 4, 3, 2, 1, 3]); // [1, 2, 3, 4]
var a = {a: 3};
var b = {b: 4};
var c = {c: 5};
unique([a, a, b, c, b]); // [a, b, c]
unique([1, '1', 2, '2', 3, 2]); // [1, '1', 2, '2', 3]
// declaring sorted array for performance
unique([1, 1, '1', 2, 2, 5, '5', '5'], true); // [1, '1', 2, 5, '6']
// declaring strings array for performance
unique(['a', 'c', 'b', 'c', 'a'], false, true); // ['a', 'b', 'c']npm install just-flatten-it
import flatten from 'just-flatten-it';
flatten([[1, [2, 3]], [[4, 5], 6, 7, [8, 9]]]);
// [1, 2, 3, 4, 5, 6, 7, 8, 9]npm install just-index
import index from 'just-index';
index([{id: 'first', val: 1}, {id: 'second', val: 2}], 'id');
// {first: {id: 'first', val: 1}, second: {id: 'second', val: 2}}
index([{id: 'first', val: 1}, null], 'id'); // {first: {id: 'first', val: 1}}
index([], 'id'); // {}
index([], null); // undefined
index({}, 'id'); // undefinednpm install just-insert
import insert from 'just-insert';
insert([1, 2, 5, 6], ['a', 'c', 'e'], 2); // [1, 2, 'a', 'c', 'e', 5, 6]
insert([1, 2, 5, 6], 'a', 2); // [1, 2, 'a', 5, 6]
insert([1, 2, 5, 6], ['a', 'c', 'e'], 0); // ['a', 'c', 'e', 1, 2, 5, 6]
insert([1, 2, 5, 6], ['a', 'c', 'e']); // ['a', 'c', 'e', 1, 2, 5, 6]npm install just-intersect
import intersect from 'just-intersect';
intersect([1, 2, 5, 6], [2, 3, 5, 6]); // [2, 5, 6]npm install just-compact
import compact from 'just-compact';
compact([1, null, 2, undefined, null, NaN, 3, 4, false, 5]); // [1, 2, 3, 4, 5]
compact([1, 2, [], 4, {}]); // [1, 2, [], 4, {}]
compact([]); // []
compact({}); // undefinednpm install just-last
import last from 'just-last';
last([1, 2, 3, 4, 5]); // 5
last([{a: 1}, {b: 1}, {c: 1}]); // {c: 1}
last([true, false, [true, false]]); // [true, false]
last(); // undefined
last([]); // undefined
last(null); // undefined
last(undefined); // undefinednpm install just-tail
import tail from 'just-tail';
tail([1, 2, 3, 4, 5]); // [2, 3, 4, 5]
tail([{a: 1}, {b: 1}, {c: 1}]); // [{b: 1}, {c: 1}]
tail([true, false, [true, false]]); // [false, [true, false]]
tail([]); // []
tail(); // undefined
tail(null); // undefined
tail(undefined); // undefinednpm install just-random
import random from 'just-random';
random([1, 2, 3]); // one of [1, 2, 3], at randomnpm install just-shuffle
import shuffle from 'just-shuffle';
shuffle([1, 2, 3]); // array with original elements randomly sorted
shuffle([1]); // [1]
shuffle(); // undefined
shuffle(undefined); // undefined
shuffle(null); // undefined
shuffle({}); // undefinednpm install just-range
import range from 'just-range';
range(1, 5); // [1, 2, 3, 4]
range(5); // [0, 1, 2, 3, 4]
range(-5); // [0, -1, -2, -3, -4]
range(0, 20, 5) // [0, 5, 10, 15]npm install just-remove
import remove from 'just-remove';
remove([1, 2, 3, 4, 5, 6], [1, 3, 6]); // [2, 4, 5]npm install just-union
import union from 'just-union';
union([1, 2, 5, 6], [2, 3, 4, 6]); // [1, 2, 3, 4, 5, 6]npm install just-template
import template from 'just-template';
const data = {
a: {
aa: {
aaa: 'apple',
bbb: 'pear'
},
bb: 'orange'
},
b: 'plum'
};
template('2 ${a.aa.aaa}s, a ${a.aa.bbb}, 3 ${a.bb}s and a ${b}. Yes 1 ${a.aa.bbb}.', data);
// '2 apples, a pear, 3 oranges and a plum. Yes 1 pear.'npm install just-truncate
truncate('when shall we three meet again', 9); // 'when s...'
truncate('when shall we three meet again', 12, ' (etc)'); // 'when s (etc)'
truncate('when shall we', 15,); // 'when shall we'
truncate('when shall we', 15, '(more)'); // 'when shall we'
truncate('when shall we', 10, ' (etc etc etc)'); // ' (etc etc etc)'npm install just-prune
prune('when shall we three meet again', 7); // 'when...'
prune('when shall we three meet again', 7, ' (more)'; // 'when (more)'
prune('when shall we', 15,); // 'when shall we'
prune('when shall we', 15, ' (etc)'); // 'when shall we'
prune('when shall we', 7, ' (more)'); // ' (more)'npm install just-squash
squash('the cat sat on the mat'); // 'thecatsatonthemat'
squash(' the cat sat on the mat '); // 'thecatsatonthemat'
squash('\tthe cat\n sat \fon \vthe \rmat '); // '\tthecat\nsat\fon\vthe\rmat'
squash('\tthe cat\n sat \fon \vthe \rmat ', true); // 'thecatsatonthemat'
squash(`the cat
sat on the mat`, true); // thecatsatonthematnpm install just-left-pad
leftPad('hello', 9); // ' hello'
leftPad('hello', 3); 'hello'
leftPad('hello', 9, '.'); '....hello'
leftPad(['hello'], 7, '_'); '__hello'
leftPad(null, 7); ' null'npm install just-right-pad
rightPad('hello', 9); // 'hello '
rightPad('hello', 3); 'hello'
rightPad('hello', 9, '.'); 'hello....'
rightPad(['hello'], 7, '_'); 'hello__'
rightPad(null, 7); 'null 'npm install just-camel-case
camelCase('the quick brown fox'); // 'theQuickBrownFox'
camelCase('the_quick_brown_fox'); // 'theQuickBrownFox'
camelCase('the-quick-brown-fox'); // 'theQuickBrownFox'
camelCase('theQuickBrownFox'); // 'theQuickBrownFox'
camelCase('thequickbrownfox'); // 'thequickbrownfox'
camelCase('the - quick * brown# fox'); // 'theQuickBrownFox'
camelCase('theQUICKBrownFox'); // 'theQUICKBrownFox'npm install just-kebab-case
kebabCase('the quick brown fox'); // 'the-quick-brown-fox'
kebabCase('the-quick-brown-fox'); // 'the-quick-brown-fox'
kebabCase('the_quick_brown_fox'); // 'the-quick-brown-fox'
kebabCase('theQuickBrownFox'); // 'the-quick-brown-fox'
kebabCase('theQuickBrown Fox'); // 'the-quick-brown-fox'
kebabCase('thequickbrownfox'); // 'thequickbrownfox'
kebabCase('the - quick * brown# fox'); // 'the-quick-brown-fox'
kebabCase('theQUICKBrownFox'); // 'the-q-u-i-c-k-brown-fox'npm install just-snake-case
snakeCase('the quick brown fox'); // 'the_quick_brown_fox'
snakeCase('the-quick-brown-fox'); // 'the_quick_brown_fox'
snakeCase('the_quick_brown_fox'); // 'the_quick_brown_fox'
snakeCase('theQuickBrownFox'); // 'the_quick_brown_fox'
snakeCase('theQuickBrown Fox'); // 'the_quick_brown_Fox'
snakeCase('thequickbrownfox'); // 'thequickbrownfox'
snakeCase('the - quick * brown# fox'); // 'the_quick_brown_fox'
snakeCase('theQUICKBrownFox'); // 'the_q_u_i_c_k_brown_fox'npm install just-clamp
import clamp from 'just-clamp';
var n = 5;
clamp(1, n, 12); // 5
clamp(1, n, 3); // 3
clamp(8, n, 9); // 8
clamp(0, n, 0); // 0
n = undefined;
clamp(3, n, 8); // 3
n = null;
clamp(3, n, 8); // 3
n = NaN;
clamp(3, n, 8); // 3npm install just-modulo
import modulo from 'just-modulo';
modulo(7, 5); // 2
modulo(17, 23); // 17
modulo(16.2, 3.8); // 17
modulo(5.8, 3.4); //2.4
modulo(4, 0); // 4
modulo(-7, 5); // 3
modulo(-2, 15); // 13
modulo(-5.8, 3.4); // 1
modulo(12, -1); // NaN
modulo(-3, -8); // NaN
modulo(12, 'apple'); // NaN
modulo('bee', 9); // NaN
modulo(null, undefined); // NaNnpm install just-compose
import compose from 'just-compose';
const sqRootBiggest = compose(Math.max, Math.sqrt, Math.trunc);
sqRootBiggest(10, 5); // 3
sqRootBiggest(7, 0, 16); // 4npm install just-curry-it
import curry from 'just-curry-it';
function converter(ratio, input) {
return (input*ratio).toFixed(1);
}
const milesToKm = curry(converter)(1.62);
milesToKm(35); // 56.7
milesToKm(10); // 16.2npm install just-demethodize
const demethodize = require('just-demethodize');
const trimFn = demethodize(''.trim);
['hello ', ' goodbye', 'hello again'].map(trimFn)npm install just-flip
import flip from 'just-flip';
flip(console.log)(1, 2, 3) // 2, 1, 3npm install just-partial-it
import partial from 'just-partial-it';
const cubedRoot = partial(Math.pow, undefined, 1/3);
cubedRoot(10).toFixed(1); // 56.7
cubedRoot(35).toFixed(1); // 16.2Run all tests as a single test suite with
npm run test
I welcome pull requests for additional utilities (and corrections to existing ones).
- must not depend on any other npm modules
- assume this is hot code and code accordingly
- favor for loops over high order functions
- don't repeatedly access the same property, assign to a var
- write es5
- api
- keep the api simple and intuitive
- avoid edge case arguments whenever possible
- README
- limit README to examples of each use case
- if you must explain the api (see api section) add a comment in the README example code
- add a section in the general README that matches the README for your module
- tests
- write a test for each use case
- include tests for all README examples
- Interactive gh-page (anguscroll.com/just)
- I can update this afterwards