permutation-iterator

Iterate by permutations in a list

Install

$ npm install permutation-iterator

Usage

Array

const permutationIterator = require('permutation-iterator');

const it = permutationIterator(['a', 'b', 'c']);

it.next(); // => { value: ['a', 'b', 'c'], done: false }
it.next(); // => { value: ['b', 'a', 'c'], done: false }
it.next(); // => { value: ['c', 'a', 'b'], done: false }
it.next(); // => { value: ['a', 'c', 'b'], done: false }
it.next(); // => { value: ['b', 'c', 'a'], done: false }
it.next(); // => { value: ['c', 'b', 'a'], done: false }
it.next(); // => { value: undefined, done: true }

Object

const it = permutationIterator({
  1: 'a',
  2: 'b',
  3: 'c'
});

// Same bahavior as arrays
it.next(); // => { value: ['a', 'b', 'c'], done: false }

License

MIT © Thibaut Vieux