Checks if array has a permutation. :running: :vhs: :package: :moon:

Alternatives: compare, map. Similar: permutation, permutations, isPermutation. This is part of package extra-array.

array.isPermutationOn(x, y, [fn], [ths]);
// x:   an array
// y:   permutation?
// fn:  map function (v, i, x)
// ths: this argument

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

var x = [1, 2, 3, 4];
array.isPermutationOn(x, [4, 3, 2, 1]);
// true

array.isPermutationOn(x, [3, -1, -2, 4]);
// false

array.isPermutationOn(x, [3, -1, -2, 4], v => Math.abs(v));
// true

references

• Data.List.permutations: Haskell
• List-Extra.isPermutationOf: elm