ipermutations (original) (raw)
List all possible permutations.
Alternatives: ipermutations, permutations.
Similar: randomPermutation, permutations, hasPermutation.
function ipermutations(x, n) // x: an array // n: number of values [-1 ⇒ any]
const xarray = require('extra-array');
[...xarray.ipermutations([1, 2])]; // → [ [], [ 1 ], [ 2 ], [ 1, 2 ], [ 2, 1 ] ]
[...xarray.ipermutations([1, 2, 3])]; // → [ // [], [ 1 ], // [ 2 ], [ 3 ], // [ 1, 2 ], [ 1, 3 ], // [ 2, 1 ], [ 2, 3 ], // [ 3, 1 ], [ 3, 2 ], // [ 1, 2, 3 ], [ 1, 3, 2 ], // [ 2, 1, 3 ], [ 2, 3, 1 ], // [ 3, 1, 2 ], [ 3, 2, 1 ] // ]
[...xarray.ipermutations([1, 2, 3], 2)]; // → [ [ 1, 2 ], [ 1, 3 ], [ 2, 1 ], [ 2, 3 ], [ 3, 1 ], [ 3, 2 ] ]