angus-c/just

// esm (node / bundler)
import clone from 'just-clone';

// esm (native browser code)
import clone from './node_modules/just-clone/index.mjs';

// cjs
const clone = require('just-clone');

npm install just-diff

yarn add just-diff

import {diff} from 'just-diff';

const obj1 = {a: 4, b: 5};
const obj2 = {a: 3, b: 5};
const obj3 = {a: 4, c: 5};

diff(obj1, obj2);
[
  { "op": "replace", "path": ['a'], "value": 3 }
]

diff(obj2, obj3);
[
  { "op": "remove", "path": ['b'] },
  { "op": "replace", "path": ['a'], "value": 4 }
  { "op": "add", "path": ['c'], "value": 5 }
]

// using converter to generate jsPatch standard paths
import {diff, jsonPatchPathConverter} from 'just-diff'
diff(obj1, obj2, jsonPatchPathConverter);
[
  { "op": "replace", "path": '/a', "value": 3 }
]

diff(obj2, obj3, jsonPatchPathConverter);
[
  { "op": "remove", "path": '/b' },
  { "op": "replace", "path": '/a', "value": 4 }
  { "op": "add", "path": '/c', "value": 5 }
]

// arrays
const obj4 = {a: 4, b: [1, 2, 3]};
const obj5 = {a: 3, b: [1, 2, 4]};
const obj6 = {a: 3, b: [1, 2, 4, 5]};

diff(obj4, obj5);
[
  { "op": "replace", "path": ['a'], "value": 3 }
  { "op": "replace", "path": ['b', 2], "value": 4 }
]

diff(obj5, obj6);
[
  { "op": "add", "path": ['b', 3], "value": 5 }
]

// nested paths
const obj7 = {a: 4, b: {c: 3}};
const obj8 = {a: 4, b: {c: 4}};
const obj9 = {a: 5, b: {d: 4}};

diff(obj7, obj8);
[
  { "op": "replace", "path": ['b', 'c'], "value": 4 }
]

diff(obj8, obj9);
[
  { "op": "replace", "path": ['a'], "value": 5 }
  { "op": "remove", "path": ['b', 'c']}
  { "op": "add", "path": ['b', 'd'], "value": 4 }
]

npm install just-diff-apply

yarn add just-diff-apply

  import {diffApply} from 'just-diff-apply';

  const obj1 = {a: 3, b: 5};
  diffApply(obj1,
    [
      { "op": "remove", "path": ['b'] },
      { "op": "replace", "path": ['a'], "value": 4 },
      { "op": "add", "path": ['c'], "value": 5 }
    ]
  );
  obj1; // {a: 4, c: 5}

  const obj2 = {a: 3, b: 5};
  diffApply(obj2,
    [
      { "op": "move", "from": ['a'], "path": ['c']},
    ]
  );
  obj2; // {b: 5, c: 3}

  // using converter to apply jsPatch standard paths
  // see http://jsonpatch.com
  import {diffApply, jsonPatchPathConverter} from 'just-diff-apply'
  const obj3 = {a: 3, b: 5};
  diffApply(obj3, [
    { "op": "remove", "path": '/b' },
    { "op": "replace", "path": '/a', "value": 4 }
    { "op": "add", "path": '/c', "value": 5 }
  ], jsonPatchPathConverter);
  obj3; // {a: 4, c: 5}

  // arrays (array key can be string or numeric)
  const obj4 = {a: 4, b: [1, 2, 3]};
  diffApply(obj4, [
    { "op": "replace", "path": ['a'], "value": 3 }
    { "op": "replace", "path": ['b', 2], "value": 4 }
    { "op": "add", "path": ['b', 3], "value": 9 }
  ]);
  obj4; // {a: 3, b: [1, 2, 4, 9]}

  // nested paths
  const obj5 = {a: 4, b: {c: 3}};
  diffApply(obj5, [
    { "op": "replace", "path": ['a'], "value": 5 }
    { "op": "remove", "path": ['b', 'c']}
    { "op": "add", "path": ['b', 'd'], "value": 4 }
  ]);
  obj5; // {a: 5, b: {d: 4}}

npm install just-compare

yarn add 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}]]); // false
compare([1, [2, {a: 4}], 4], [1, [2, {a: 4}], 4]); // true
compare(NaN, NaN); // true

npm install just-clone

yarn add just-clone

// Deep copies objects and arrays, doesn't clone functions

import clone from 'just-clone';

var arr = [1, 2, 3];
var subObj = { aa: 1 };
var obj = { a: 3, b: 5, c: arr, d: subObj };
var objClone = clone(obj);
arr.push(4);
objClone.d.bb = 2;
obj; // {a: 3, b: 5, c: [1, 2, 3, 4], d: {aa: 1}}
objClone; // {a: 3, b: 5, c: [1, 2, 3], d: {aa: 1, bb: 2}}

npm install just-pluck-it

yarn add 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

yarn add 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, true, [null]]
flush({a: 2, b: null, c: 4, d: undefined}); // {a: 2, c: 4}
flush('something'); // undefined
flush(); // undefined

npm install just-extend

yarn add just-extend

import extend from 'just-extend';

var obj = {a: 3, b: 5};
extend(obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
obj; // {a: 4, b: 5, c: 8}

var obj = {a: 3, b: 5};
extend({}, obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
obj; // {a: 3, b: 5}

var arr = [1, 2, 3];
var 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]}

var arr = [1, 2, 3];
var 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]}

extend({a: 4, b: 5}); // {a: 4, b: 5}
extend({a: 4, b: 5}, 3); {a: 4, b: 5}
extend({a: 4, b: 5}, true); {a: 4, b: 5}
extend('hello', {a: 4, b: 5}); // throws
extend(3, {a: 4, b: 5}); // throws

npm install just-merge

yarn add just-merge

import merge from 'just-merge';

let obj = {a: 3, b: 5};
merge(obj, {a: 4, c: 8}); // {a: 4, b: 5, c: 8}
obj; // {a: 4, b: 5, c: 8}

let obj = {a: 3, b: 5};
merge({}, 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};
merge(obj, {c: arr}); // {a: 3, b: 5, c: [1, 2, 3]}
arr.push[4];
obj; // {a: 3, b: 5, c: [1, 2, 3, 4]}

merge({a: 4, b: 5}); // {a: 4, b: 5}
merge(3, {a: 4, b: 5}); // throws
merge({a: 4, b: 5}, 3); // throws
merge({a: 4, b: 5}, {b: 4, c: 5}, 'c'); // throws

npm install just-values

yarn add just-values

const values = require('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(new String('hello')); // ['h', 'e', 'l', 'l', 'o']
values(1); // throws exception
values(true); // throws exception
values(undefined); // throws exception
values(null); // throws exception

npm install just-entries

yarn add just-entries

import entries from 'just-entries';

// Object:
entries({c: 8, a: 4}); // [['c', 8], ['a', 4]]
entries({b: {bb: 4}, a: {aa: 2}}); // [['b', {bb: 4}], ['a', {aa: 2}]]
entries({}); // []

// Array:
entries([{c: 8}, {a: 4}]); // [[0, {c: 8}], [1, {a: 4}]]
entries(['À', 'mauvais', 'ouvrier', 'point', 'de', 'bon', 'outil'])
// [[0, 'À'], [1, 'mauvais'] ... [6, 'outil']]
entries([]); // []

npm install just-pick

yarn add 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}
pick(obj, ['a', 'a']); // {a: 3}

npm install just-omit

yarn add 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

yarn add just-is-empty

import isEmpty from 'just-is-empty';
 isEmpty({a: 3, b: 5}) // false
 isEmpty([1, 2]) // false
 isEmpty(new Set([1, 2, 2])) // false
 isEmpty((new Map()).set('a', 2)) // false
 isEmpty({}) // true
 isEmpty([]) // true
 isEmpty(new Set()) // true
 isEmpty(new Map()) // true
 isEmpty('abc') // false
 isEmpty('') // true
 isEmpty(0) // true
 isEmpty(1) // true
 isEmpty(true) // true
 isEmpty(Symbol('abc')); // true
 isEmpty(//); // true
 isEmpty(new String('abc')); // false
 isEmpty(new String('')); // true
 isEmpty(new Boolean(true)); // true
 isEmpty(null) // true
 isEmpty(undefined) // true

npm install just-is-circular

yarn add 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); // false

npm install just-is-primitive

yarn add 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/) // false

npm install just-filter-object

yarn add just-filter-object

import filter from 'just-filter';

// 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

yarn add just-map-object

import map from 'just-map-object';

// DEPRECATED: use just-map-values
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-map-values

yarn add just-map-values

import map from 'just-map-values';

// predicate updates values, receives (value, key, obj)
map({a: 3, b: 5, c: 9}, (value) => value + 1); // {a: 4, b: 6, c: 10}
map({a: 3, b: 5, c: 9}, (value, key) => value + key); // {a: 3a, b: 5b, c: 9c}
map({a: 3, b: 5, c: 9}, (value, key, obj) => obj.b); // {a: 5, b: 5, c: 5}

npm install just-map-keys

yarn add just-map-keys

import map from 'just-map-keys';

// predicate updates keys, receives (value, key, object)
map({a: 'cow', b: 'sheep', c: 'pig'}, (value) => value);
  // {cow: 'cow', sheep: 'sheep', pig: 'pig'}
map([4, 5, 6], (value, key) => key + 1); // {1: 4, 2: 5, 3: 6}
map({a: 3, b: 5, c: 9}, (value, key) => key + value); // {a3: 3, b5: 5, c9: 9}
map({a: 3, b: 5, c: 9}, (value, key, obj) => obj.b + value + key);
  // {'8a': 3, '10b': 5, '14c': 9}

npm install just-deep-map-values

yarn add just-deep-map-values

import deepMapValues from 'just-deep-map-values';

const squareFn = (number) => number * number;
deepMapValues({ a: 1, b: { c: 2, d: { e: 3 } } }, squareFn); // => { a: 1, b: { c: 4, d: { e: 9 } } }

npm install just-reduce-object

yarn add 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;
}); // 17

npm install just-safe-get

yarn add 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']); // undefined

get(obj.b, 'bb.bbb', 5); // 5
get(obj.b, ['bb', 'bbb'], true); // true

get(null, 'a'); // undefined
get(undefined, ['a']); // undefined

get(null, 'a', 42); // 42
get(undefined, ['a'], 42); // 42

const obj = {a: {}};
const sym = Symbol();
obj.a[sym] = 4;
get(obj.a, sym); // 4

npm install just-safe-set

yarn add 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 obj5 = {a: {}};
const sym = Symbol();
set(obj5.a, sym, 7); // true
obj5; // {a: {Symbol(): 7}}

npm install just-typeof

yarn add 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

yarn add 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-has

yarn add just-has

import has from 'just-has';

const obj = {a: {aa: {aaa: 2}}, b: 4};

has(obj, 'a.aa.aaa'); // true
has(obj, ['a', 'aa', 'aaa']); // true

has(obj, 'b.bb.bbb'); // false
has(obj, ['b', 'bb', 'bbb']); // false

has(obj.a, 'aa.aaa'); // true
has(obj.a, ['aa', 'aaa']); // true

has(obj.b, 'bb.bbb'); // false
has(obj.b, ['bb', 'bbb']); // false

has(null, 'a'); // false
has(undefined, ['a']); // false

const obj = {a: {}};
const sym = Symbol();
obj.a[sym] = 4;
has(obj.a, sym); // true

npm install just-cartesian-product

yarn add just-cartesian-product

import cartesianProduct from 'just-cartesian-product';

cartesianProduct([[1, 2], ['a', 'b']]); // [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
cartesianProduct([[1, 2], ['a', 'b', 'c']]); // [[1, 'a'], [1, 'b'], [1, 'c'], [2, 'a'], [2, 'b'], [2, 'c']]
cartesianProduct([]); // []
cartesianProduct(); // throws

npm install just-unique

yarn add 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

yarn add 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]

flatten([[1, [2, 3]], [[4, 5], 6, 7, [8, 9]]], 1);
// [1, [2, 3], [[4, 5], 6, 7, [8, 9]]]

npm install just-index

yarn add 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'); // undefined

npm install just-insert

yarn add 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

yarn add just-intersect

import intersect from 'just-intersect';

intersect([1, 2, 5, 6], [2, 3, 5, 6]); // [2, 5, 6]
intersect([1, 2, 2, 4, 5], [3, 2, 2, 5, 7]); // [2, 5]  

npm install just-compact

yarn add 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({}); // throws

npm install just-last

yarn add 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); // undefined

npm install just-tail

yarn add 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); // undefined

npm install just-random

yarn add just-random

import random from 'just-random';

random([1, 2, 3]);
// one of [1, 2, 3], at random

npm install just-shuffle

yarn add just-shuffle

import shuffle from 'just-shuffle';

shuffle([1, 2, 3]); 
// array with original elements randomly sorted
shuffle([1, 2, 3], {shuffleAll: true}); 
// array with original elements randomly sorted and all in new postions
shuffle([]); // []
shuffle([1]); // [1]
shuffle(); // throws
shuffle(undefined); // throws
shuffle(null); // throws
shuffle({}); // throws

npm install just-split

yarn add just-split

import split from 'just-split';

split([]); // []
split([1, 2, 3, 4, 5]); // [[1, 2, 3, 4, 5]]
split([1, 2, 3, 4, 5, 6, 7, 8, 9], 3); // [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
split([1, 2, 3, 4, 5, 6, 7, 8, 9], '3'); // [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
split(['a', 'b', 'c', 'd', 'e'], 2); // [['a', 'b'], ['c', 'd'], ['e']]
split([1, 2, 3, 4, 5, 6, 7, 8], 3); // [[1, 2, 3], [4, 5, 6], [7, 8]]

npm install just-split-at

yarn add just-split-at

import splitAt from 'just-split-at';

splitAt([1, 2, 3, 4, 5], 2); // [[1, 2], [3, 4, 5]]
splitAt([{a: 1}, {b: 1}, {c: 1}], -1); // [[{a: 1}, {b: 1}], [{c: 1}]]
splitAt([], 2); // [[], []]
splitAt(null, 1); // throws
splitAt(undefined, 1); // throws

npm install just-order-by

yarn add just-order-by

import orderBy from 'just-order-by';

orderBy([10, 1, 5, 20, 15, 35, 30, 6, 8]); // [1, 5, 6, 8, 10, 15, 20, 30, 35]

orderBy(
  [
    { user: 'fabio', details: { city: 'Milan', age: 34 } },
    { user: 'max', details: { city: 'Munich', age: 29 } },
    { user: 'zacarias', details: { city: 'Sao Paulo', age: 44 } },
    { user: 'robert', details: { city: 'Manchester', age: 28 } },
    { user: 'max', details: { city: 'Zurich', age: 38 } },
  ],
  [
    {
      property(v) {
        return v.details.age;
      },
    },
  ]
);

/*
[
  {user: 'robert', age: 28},
  {user: 'max', age: 29},
  {user: 'fabio', age: 34},
  {user: 'klaus', age: 38},
  {user: 'zacarias', age: 44},
]
*/

orderBy(
  [
    {user: 'fabio', age: 34},
    {user: 'max', age: 29},
    {user: 'zacarias', age: 44},
    {user: 'robert', age: 28},
    {user: 'klaus', age: 38},
  ],
  [
    {
      property: 'user',
    },
  ]
);

/*
[
  {user: 'fabio', age: 34},
  {user: 'klaus', age: 38},
  {user: 'max', age: 29},
  {user: 'robert', age: 28},
  {user: 'zacarias', age: 44},
]
*/

orderBy(
  [
    { user: 'fabio', age: 34 },
    { user: 'max', age: 29 },
    { user: 'zacarias', age: 44 },
    { user: 'moris', age: 28 },
    { user: 'max', age: 38 },
  ],
  [
    {
      property: 'user',
      order: 'desc',
    },
    {
      property(v) {
        return v.age;
      },
    },
  ]
);

/*
[
  {
    user: 'zacarias',
    age: 44
  },
  {
    user: 'moris',
    age: 28
  },
  {
    user: 'max',
    age: 29
  },
  {
    user: 'max',
    age: 38
  },
  {
    user: 'fabio',
    age: 34
  }
]
*/

npm install just-sort-by

yarn add just-sort-by

import sortBy from 'just-sort-by';

sortBy([10, 1, 5, 20, 15, 35, 30, 6, 8]); // [1, 5, 6, 8, 10, 15, 20, 30, 35]

sortBy([
  {user: 'fabio', details: {city: "Milan", age: 34}},
  {user: 'max', details: {city: "Munich", age: 29}},
  {user: 'zacarias', details: {city: "Sao Paulo", age: 44}},
  {user: 'robert', details: {city: "Manchester", age: 28}},
  {user: 'klaus', details: {city: "Zurich", age: 38}},
], function(o) {
  return o.details.age;
});

/*
[
  {user: 'robert', age: 28},
  {user: 'max', age: 29},
  {user: 'fabio', age: 34},
  {user: 'klaus', age: 38},
  {user: 'zacarias', age: 44},
]
*/

sortBy([
  {user: 'fabio', age: 34},
  {user: 'max', age: 29},
  {user: 'zacarias', age: 44},
  {user: 'robert', age: 28},
  {user: 'klaus', age: 38},
], 'user');
/*
[
  {user: 'fabio', age: 34},
  {user: 'klaus', age: 38},
  {user: 'max', age: 29},
  {user: 'robert', age: 28},
  {user: 'zacarias', age: 44},
]
*/

npm install just-partition

yarn add just-partition

import partition from 'just-partition';

partition([1, 5, 2, 4, 3], n => n > 3); // [[5, 4],[1, 2, 3]]
partition(['a', 2, 3, '3'], x => typeof x == 'string'); // [['a', '3'],[2, 3]]
partition([1, 2, 3, 4], x => typeof x == 'number'); // [[1, 2, 3, 4],[]]
partition([1, 2, 3, 4], x => typeof x == 'string'); // [[], [1, 2, 3, 4]]
partition([], n => n > 3); // [[], []]
partition({a: 1, b: 2}, n => n > 1); // throws
partition(null, n => n > 1); // throws
partition(undefined, n => n > 1); // throws

npm install just-permutations

yarn add just-permutations

import permutations from 'just-permutations';

permutations([1, 2, 3]); // [[1, 2, 3], [2, 1, 3], [2, 3, 1], [1, 3, 2], [3, 1, 2], [3, 2, 1]]
permutations([]); // []
permutations(); // throws

npm install just-range

yarn add 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

yarn add just-remove

import remove from 'just-remove';

remove([1, 2, 3, 4, 5, 6], [1, 3, 6]); // [2, 4, 5]

npm install just-union

yarn add just-union

import union from 'just-union';

union([1, 2, 5, 6], [2, 3, 4, 6]); // [1, 2, 5, 6, 3, 4]

npm install just-zip-it

yarn add just-zip-it

import zip from 'just-zip-it';

zip([1, 2, 3]); // [[1], [2], [3]]
zip([1, 2, 3], ['a', 'b', 'c']); // [[1, 'a'], [2, 'b'], [3, 'c']]
zip([1, 2], ['a', 'b'], [true, false]); //[[1, 'a', true], [2, 'b', false]]

zip(undefined, {}, false, 1, 'foo'); // []
zip([1, 2], ['a', 'b'], undefined, {}, false, 1, 'foo'); // [[1, 'a'], [2, 'b']]

zip([1, 2, 3], ['a', 'b'], [true]); // [[1, 'a', true], [2, 'b', undefined], [3, undefined, undefined]]

npm install just-group-by

yarn add just-group-by

import groupBy from 'just-group-by';

groupBy([6.1, 4.2, 6.3], Math.floor); // { '4': [4.2], '6': [6.1, 6.3] }
groupBy([1,2,3,4,5,6,7,8], function(i) { return i % 2}); // { '0': [2, 4, 6, 8], '1': [1, 3, 5, 7] }

npm install just-mean

yarn add just-mean

import mean from 'just-mean';

mean([1, 2, 3, 2, 4, 1]); // 2.1666666667
mean(3, 2, 1); // 2
mean([4]); // 4
mean(['3', 2]); // throws
mean(); // throws

npm install just-median

yarn add just-median

import median from 'just-median';

median([1, 2, 3, 4, 5]); // 3
median([3, -1, 2]); // 2
median([9, 14, 14, 200, 15]); // 14
median(1, 2, 4, 3); // 2.5
median(['3', 2, 1]); // throws
median(); // throws

npm install just-mode

yarn add just-mode

import mode from 'just-mode';

mode([1, 2, 3, 2]); // 2
mode(4, 4, 1, 4); // 4
mode(100, 100, 101, 101); // [100, 101]
mode(4, 3, 2, 1); // [1, 2, 3, 4]
mode(['1', 2, 2, 1, 2]); // throws
mode(null); // throws

npm install just-percentile

yarn add just-percentile

import percentile from 'just-percentile';

percentile([1, 2, 3], 0); // 1
percentile([1, 2, 3], 0.5); // 2
percentile([1, 2, 3], 1); // 3

// See https://en.wikipedia.org/wiki/Percentile (linear interpolation method)
percentile([15, 20, 35, 40, 50], 0.05); // 15
percentile([15, 20, 35, 40, 50], 0.3); // 20
percentile([15, 20, 35, 40, 50], 0.4); // 27.5
percentile([15, 20, 35, 40, 50], 0.95); // 50

percentile(1, 2, 3, 50); // throws
percentile(['1', 2, 3], 50); // throws
percentile([], 50); // throws

npm install just-variance

yarn add just-variance

import variance from 'just-variance';

variance([1, 2, 3, 2, 4, 1]); // 1.3666666667
variance(3, 2, 1); // 1
variance([100, 100, 100.1, 100]); // 0.0025
variance(1, 2, 3, 4, 5, -6); // 15.5
variance([4]); // throws
variance(['3', 2]); // throws
variance(NaN, NaN); // throws
variance(); // throws

npm install just-standard-deviation

yarn add just-standard-deviation

import standardDeviation from "just-standard-deviation";

standardDeviation([1, 2, 3, 2, 4, 1]); // 1.16904519
standardDeviation(3, 2, 1); // 1
standardDeviation([100, 100, 100.1, 100]); // 0.05
standardDeviation(1, 2, 3, 4, 5, -6); // 3.9370039
standardDeviation([4]); // throws
standardDeviation(["3", 2]); // throws
standardDeviation(NaN, NaN); // throws
standardDeviation(); // throws

npm install just-skewness

yarn add just-skewness

import skewness from "just-skewness";

// Using Pearson's second skewness coefficient
skewness(3, 2, 1); // 0
skewness([1, 2, 3, 2, 4, 1]); // 0.4276994613841504
skewness(1, 2, 3, 4, 5, -6); // -0.762000762001143
skewness([1, 2, 3, 4, 9]); // 0.7705935588815224
skewness([4]); // throws
skewness(["3", 2]); // throws
skewness(NaN, NaN); // throws
skewness(); // throws

npm install just-template

yarn add just-template

import template from 'just-template';

var 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

yarn add just-truncate

  truncate('when shall we three meet again', 9); // 'when s...'
  truncate('when shall we three meet again', 10, ' (etc)'); // 'when (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

yarn add 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

yarn add 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); // thecatsatonthemat

npm install just-left-pad

yarn add just-left-pad

import leftPad from 'just-left-pad';

leftPad('hello', 9); // '    hello'
leftPad('hello', 3); // 'hello'
leftPad('hello', 9, '.'); // '....hello'
leftPad('hello', 9, '..'); // '....hello'
leftPad('hello', 10, 'ab'); // 'bababhello'
leftPad('hello', 9, '\uD83D\uDC04'); // '🐄🐄🐄🐄hello'
leftPad('hello', 10, '\uD83D\uDC11\uD83D\uDC04'), // '🐄🐑🐄🐑🐄hello'
leftPad('hello', 7, '🐄'), // '🐄🐄hello'
leftPad(null, 7); // throws
leftPad([], 4, '*'); // throws
leftPad('hello', 4, true); // throws
leftPad('hello', -4, true); // throws  
leftPad('hello', 2.3, true); // throws    

npm install just-right-pad

yarn add just-right-pad

import rightPad from 'just-right-pad';

rightPad('hello', 9); // 'hello    '
rightPad('hello', 3); // 'hello'
rightPad('hello', 9, '.'); // 'hello....'
rightPad('hello', 9, '..'); // 'hello....'
rightPad('hello', 10, 'ab'); // 'helloababa'
rightPad('hello', 9, '\uD83D\uDC04'); // 'hello🐄🐄🐄🐄'
rightPad('hello', 10, '\uD83D\uDC11\uD83D\uDC04'), // 'hello🐑🐄🐑🐄🐑'
rightPad('hello', 7, '🐄'), // 'hello🐄🐄'
rightPad(null, 7); // throws
rightPad([], 4, '*'); // throws
rightPad('hello', 4, true); // throws
rightPad('hello', -4, true); // throws  
rightPad('hello', 2.3, true); // throws    

npm install just-camel-case

yarn add just-camel-case

  import camelCase from '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('behold theQuickBrownFox'); // 'beholdTheQuickBrownFox'
  camelCase('Behold theQuickBrownFox'); // 'beholdTheQuickBrownFox'
  // all caps words are camel-cased
  camelCase('The quick brown FOX'), 'theQuickBrownFox');
  // all caps substrings >= 4 chars are camel-cased
  camelCase('theQUickBrownFox'); // 'theQUickBrownFox'
  camelCase('theQUIckBrownFox'); // 'theQUIckBrownFox'
  camelCase('theQUICKBrownFox'); // 'theQuickBrownFox'

npm install just-kebab-case

yarn add just-kebab-case

  import kebabCase from '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

yarn add just-snake-case

  import snakeCase from '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('thequickbrownfox'); // 'thequickbrownfox'
  snakeCase('the - quick * brown# fox'); // 'the_quick_brown_fox'
  snakeCase('theQUICKBrownFox'); // 'the_q_u_i_c_k_brown_fox'

npm install just-pascal-case

yarn add just-pascal-case

  import pascalCase from 'just-pascal-case';

  pascalCase('the quick brown fox'); // 'TheQuickBrownFox'
  pascalCase('the_quick_brown_fox'); // 'TheQuickBrownFox'
  pascalCase('the-quick-brown-fox'); // 'TheQuickBrownFox'
  pascalCase('theQuickBrownFox'); // 'TheQuickBrownFox'
  pascalCase('thequickbrownfox'); // 'Thequickbrownfox'
  pascalCase('the - quick * brown# fox'); // 'TheQuickBrownFox'
  pascalCase('theQUICKBrownFox'); // 'TheQUICKBrownFox'

npm install just-capitalize

yarn add just-capitalize

  import capitalize from 'just-capitalize';

/*
  capitalize('capitals'); // 'Capitals'
  capitalize('Capitals'); // 'Capitals'
  capitalize('many words'); // 'Many words'
  capitalize('!exclaim'); // '!exclaim'
*/

npm install just-replace-all

yarn add just-replace-all

  import replaceAll from 'just-replace-all';

/*
  replaceAll('hello, world', 'l', 'q'); // 'heqqo, worqd'
  replaceAll('hello, world', 'l', 'qq'); // 'heqqqqo, worqqd'
  replaceAll('hello, world', 'll', 'q'); // 'heqo, world'
  replaceAll('hello, world', '', 'q'); // 'hello, world'
  replaceAll('hello, world', 'l', ''); // 'heo, word'
  replaceAll('hello, world', null, 'q'); // 'hello, world'
  replaceAll('hello, world', 'l'); // throw
  replaceAll('hello, world'); // throw
  replaceAll(); // throw
  replaceAll(null, 'l', 'q'); // throw
  replaceAll('hello, world', null, 'q'); // throw
  replaceAll('hello, world', 'l', null); // throw
*/

npm install just-clamp

yarn add just-clamp

import clamp from 'just-clamp';

var n = 5;
clamp(1, n, 12); // 5
clamp(3, n, 1); // 3
clamp(8, n, 9); // 8
clamp(0, n, 0); // 0

var n = -5;
clamp(1, n, 12); // 1
clamp(-7, n, -8); // -7

clamp(NaN, n, 8); // NaN
clamp(3, n, NaN); // NaN  
clamp(3, NaN, 8); // NaN    

clamp(undefined, n, 8); // throws
clamp(3, n, 'h'); // throws  
clamp(3, false, 8); // throws 

npm install just-is-prime

yarn add just-is-prime

  import isPrime from 'just-is-prime;

/*
  isPrime(1); // false
  isPrime(2); // true
  isPrime(17); // true
  isPrime(10); // false
  isPrime(); // throws
  isPrime(null); // throws
  isPrime("js"); // throws
  isPrime({}); // throws
  isPrime(function() {}); // throws
  isPrime([]); // throws
*/

npm install just-modulo

yarn add just-modulo

import modulo from 'just-modulo';

modulo(7, 5); // 2
modulo(17, 23); // 17
modulo(16.2, 3.8); // 1
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); // NaN

npm install just-random-integer

yarn add just-random-integer

import random from 'just-random-integer';

random();
// Returns either 0 or 1
random(5);
// Returns a random integer between 0 and 5 (inclusively)
random(3, 10);
// Returns a random integer between 3 and 10 (inclusively)
random(-5.8, 10.4);
// Returns a random integer between -5 and 10 (inclusively)

npm install just-compose

yarn add just-compose

import compose from 'just-compose';

const sqRootBiggest = compose(Math.max, Math.sqrt, Math.trunc);
sqRootBiggest(10, 5); // 3
sqRootBiggest(7, 0, 16); // 4

npm install just-curry-it

yarn add just-curry-it

import curry from 'just-curry-it';

function add(a, b, c) {
  return a + b + c;
}
curry(add)(1)(2)(3); // 6
curry(add)(1)(2)(2); // 5
curry(add)(2)(4, 3); // 9

function add(...args) {
  return args.reduce((sum, n) => sum + n, 0)
}
var curryAdd4 = curry(add, 4)
curryAdd4(1)(2, 3)(4); // 10

function converter(ratio, input) {
  return (input*ratio).toFixed(1);
}
const curriedConverter = curry(converter)
const milesToKm = curriedConverter(1.62);
milesToKm(35); // 56.7
milesToKm(10); // 16.2

npm install just-demethodize

yarn add just-demethodize

import demethodize from 'just-demethodize';

const trimFn = demethodize(''.trim);
['hello ', ' goodbye', 'hello again'].map(trimFn); // ['hello', 'goodbye', 'hello again']

npm install just-flip

yarn add just-flip

import flip from 'just-flip';

flip(console.log)(1, 2, 3) // 2, 1, 3

import map from 'just-map-object';
import partial from 'just-partial';

const numbers = {x: 5, y: 10};
const flippedMap = flip(map);
const double = partial(flippedMap, (undefined, number) => number * 2);
double(numbers) // {x: 10, y: 20];

npm install just-partial-it

yarn add just-partial-it

import partial from 'just-partial-it';

const cubedRoot = partial(Math.pow, _, 1/3);
cubedRoot(64); // 4

const getRoot = partial(Math.pow, 64);
getRoot(1/2); // 8

npm install just-pipe

yarn add just-pipe

import pipe from 'just-pipe

pipe(3, a => a+1, b => b*2) // 8
pipe('John Smith', a => a.split(' '), b => b.reverse(), c => c[0]) // 'Smith'

npm install just-debounce-it

yarn add just-debounce-it

import debounce from "just-debounce-it";

const fn1 = debounce(() => console.log("Hello"), 500);
fn1();
fn1();
fn1();
// 500ms later logs 'hello' once

const fn2 = debounce(() => console.log("Hello"), 500, true);
fn2(); // logs hello immediately
fn2();
fn2();
// 500ms later logs 'hello' once

const fn3 = debounce(() => console.log("Hello"), 500);
fn3();
fn3();
fn3();
fn3.cancel();
// function cancelled before 'hello' is logged

const fn4 = debounce(() => console.log("Hello"), 500);
fn4();
fn4();
fn4();
fn4.flush();
// immediately invoke the debounced function

npm install just-memoize

yarn add just-memoize

import memoize from 'just-memoize';

const sumByOne = memoize(function(value) {
  return value + 1;
});

sumByOne(10); // Returns value returned by the function
sumByOne(10); // Cache hit!

sumByOne(20); // Returns value returned by the function
sumByOne(20); // Cache hit!

// Custom cache key (key defaults to JSON stringified arguments)
var sum = memoize(function(a, b) {
  return a + b;
}, function(a, b) {
  return `${a}-${b}`;
});

sum(10, 10); // Returns value returned by the function
sum(10, 20); // Returns value returned by the function
sum(10, 20); // Cache hit!

npm install just-memoize-last

yarn add just-memoize-last

const memoizeLast = require('just-memoize-last')
const compare = require('just-compare')

const maxValue = memoizeLast(function(arr) {
  return Math.max(...arr)
}, function(a, b) {
  return compare(a, b)
});

maxValue([1,2,3]) // 3
maxValue([1,2,3]) // cache hit!
maxValue([1,3,4]) // 4
maxValue([1,2,3]) // 3

npm install just-random

yarn add just-random

import random from 'just-random';

random([1, 2, 3]);
// one of [1, 2, 3], at random

npm install just-throttle

yarn add just-throttle

import throttle from 'just-throttle';

// no matter how many times the function is called, only invoke once within the given interval
// options: 
// `leading`: invoke  before interval
// `trailing`: invoke afer interval

const fn1 = throttle(() => console.log('hello'), 500, {leading: true});
setInterval(fn1, 400);
// logs 'hello' immediately and then every 500ms

const fn2 = throttle(() => console.log('hello'), 500, {trailing: true});
setInterval(fn2, 400);
// logs 'hello' after 500ms and then every 500ms

const fn3 = throttle(() => console.log('hello'), 500, {leading: true, trailing: true});
// forces trailing to false

const fn4 = throttle(() => console.log('hello'), 500, { leading: false });
fn4();
fn4();
fn4();
fn4.cancel();
// function cancelled before 'hello' is logged

const fn5 = throttle(() => console.log("Hello"), 500);
fn5();
fn5();
fn5();
fn5.flush();
// immediately invoke the throttled function

npm install just-once

yarn add just-once

import once from 'just-once';

const fn = once(() => console.log('hello'));

fn();
// logs 'hello'
fn();
// does nothing