@extra-array/is-permutation/index.mjs

Checks if array has a permutation.

import isSubsequence from './isSubsequence';
/**
 * Checks if array has a permutation.
 * @param x an array
 * @param y permutation?
 * @param fc map function (v, i, x)
 * @param fm compare function (a, b)
 */
function isPermutation(x, y, fc = null, fm = null) {
    var x1 = fm ? x.map(fm) : x.slice();
    var y1 = fm ? y.map(fm) : y.slice();
    return isSubsequence(x1.sort(), y1.sort(), fc, fm);
}
export default isPermutation;
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