locustjs-extensions-array

This library contains extensions for Array.

Install

npm i locustjs-extensions-array

Usage

CommonJs

var someFn = require('locustjs-extensions-array').someFn;

ES6

import { someFn } from 'locustjs-extensions-array'

Functions

shuffle(array)

Shuffles items of an array.

import { shuffle } from 'locustjs-extensions-array'

const source = [10, 23, 14, 9, 31];
const shuffled = shuffle(source);

console.log(shuffled);  // e.g.: 14, 10, 31, 23, 9

range(from, to)

Generates an array of integer numbers starting from 'from' and ending at 'to - 1'.

import { range } from 'locustjs-extensions-array'

const arr = range(5, 10);

console.log(arr);  // 5, 6, 7, 8, 9

insertAt(array, index, item)

Inserts given item at the specified index into an array.

import { insertAt } from 'locustjs-extensions-array'

const arr = ['red', 'green'];
insertAt(arr, 1, 'blue');

console.log(arr);  // 'red', 'blue', 'green'

removeAt(array, index)

Removes item of the specified index from an array.

import { removeAt } from 'locustjs-extensions-array'

const arr = ['red', 'green', 'blue'];
removeAt(arr, 1);

console.log(arr);  // 'red', 'blue'

all(array, fn)

Iterates over an array and checks whether all items conform to a condition by calling a given function on each item.

import { all } from 'locustjs-extensions-array'

const arr = [10, 20, 30, 40];

console.log(all(arr, x => x % 2 == 0));  // true
console.log(all(arr, x => x < 40));  // false

any(array, fn)

Iterates over an array and checks if at least one item conforms to a condition by calling given function on each item.

import { any } from 'locustjs-extensions-array'

const arr = [10, 20, 30, 40];

console.log(any(arr, x => x % 2 == 0));  // true
console.log(all(arr, x => x > 40));  // false

objectify(array)

Converts an array into an object.

  input:
  [
    ["a", 1],
    ["b", "ali"]
  ]
  output: { "a": 1, "b": "ali" }

  input:
    [
      [ ["a",1],["b", "ali"] ],
      [ ["a",2],["b", "reza"],["c", true] ],
      [ ["a",3],["b"],["c", false] ],
      [ ["b", "saeed"],["c", true] ]
    ]
  output:
    [
      { "a": 1, "b": "ali" },
      { "a": 2, "b": "reza" , "c": true },
      { "a": 3, "b": null, "c": false },
      { "b": "saeed", "c": true}
    ]

sortBy(array, ...fns)

Sorts an array of objects based on different properties in those objects.

import { sortBy } from 'locustjs-extensions-array'

var arr = [
	{code: 10, parent: 1, name: 'item 1' },
	{code: 8 , parent: 2, name: 'item 2' },
	{code: 19, parent: 1, name: 'item 3' },
	{code: 3 , parent: 1, name: 'item 4' },
	{code: 5 , parent: 3, name: 'item 5' },
	{code: 11, parent: 1, name: 'item 6' },
	{code: 21, parent: 2, name: 'item 7' },
	{code: 4 , parent: 3, name: 'item 8' },
	{code: 17, parent: 2, name: 'item 9' },
	{code: 9 , parent: 1, name: 'item 10'},
	{code: 15, parent: 2, name: 'item 11'},
	{code: 16, parent: 1, name: 'item 12'}
];

var arr2 = sortBy([...arr], x => x.parent, x => x.code);

for (let item of arr2) {
	console.log(item);
}

contains(array, ...values)

Checks whether given array contains given elements.

import { contains } from 'locustjs-extensions-array'

var arr = [ 10, 14, 23, 9, 5, 34, 30, 18 ];

console.log(contains(arr, 23));   // true
console.log(contains(arr, 23, 30));   // true
console.log(contains(arr, 23, 30, 400));   // false