lodash.combinations

lodash.combinations

_.combinations(values, n)

Calculates all possible combinations of certain size.

argument	description
values	An iterable of distinct values to calculate the combinations from.
n	The Number of values to combine.

Returns a new array of combinations.

dependencies

• lodash

usage

let combinations = _.combinations([{a: 11}, {b: 22}, {c: 33}], 2);
// => [[{a: 11}, {b: 22}], [{a: 11}, {c: 33}], [{b: 22}, {c: 33}]]

---

To calculate all possible combinations of all possible sizes use this code.

let combinations = _.flatMap([1, 2, 3], (v, i, a) => _.combinations(a, i + 1));
// => [[1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3]]

---

Accepts also array-like values.

let combinations = _.combinations('abcde', 3);
// => [['a', 'b', 'c'], ['a', 'b', 'd'], ['a', 'b', 'e'], ['a', 'c', 'd'], ['a', 'c', 'e'], ['a', 'd', 'e'], ['b', 'c', 'd'], ['b', 'c', 'e'], ['b', 'd', 'e'], ['c', 'd', 'e']]

Node.js

The package can be installed via npm and used as a Node.js module.

const _ = require('lodash');
require('lodash.combinations');