Checks if array has a permutation.
Similar: permutation, permutations, isPermutation.
Similar: isValue, isPrefix, isInfix, isSuffix, isSubsequence, isPermutation.
This is part of package extra-array.
array.isPermutation(x, y, [fc], [fm]);
// x: an array
// y: permutation?
// fc: map function (v, i, x)
// fm: compare function (a, b)const array = require('extra-array');
var x = [1, 2, 3, 4];
array.isPermutation(x, [4, 3, 2, 1]);
// true
array.isPermutation(x, [3, -1, -2, 4]);
// false
array.isPermutation(x, [3, -1, -2, 4], (a, b) => Math.abs(a) - Math.abs(b));
// true
array.isPermutation(x, [3, -1, -2, 4], null, v => Math.abs(v));
// true