randomPermutation$ (original) (raw)

Pick an arbitrary permutation!

Alternatives: randomPermutation, randomPermutation$.
Similar: randomPermutation, permutations, hasPermutation.

function randomPermutation$(x, n, fr) // x: an array (updated!) // n: number of values [-1 ⇒ any] // fr: random number generator ([0, 1))

const xarray = require('extra-array');

var x = [1, 2, 3, 4, 5]; xarray.randomPermutation$(x, 5); // → [ 2, 4, 5, 1, 3 ]

x; // → [ 2, 4, 5, 1, 3 ]

var x = [1, 2, 3, 4, 5]; xarray.randomPermutation$(x, 5); // → [ 5, 3, 1, 2, 4 ]

var x = [1, 2, 3, 4, 5]; xarray.randomPermutation$(x, 3); // → [ 5, 3, 1 ]

References

• shuffle() : PHP
• Array.shuffle() : Sugar.js
• shuffle-seed : @webcaetano
• shuffle-array : @pazguille
• Seeding the random number generator in Javascript