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

Checks if array starts with a prefix.

import compare from './compare';
/**
 * Checks if array starts with a prefix.
 * @param x an array
 * @param y prefix?
 * @param fc compare function (a, b)
 * @param fm map function (v, i, x)
 */
function isPrefix(x, y, fc = null, fm = null) {
    var Y = y.length;
    return Y === 0 || compare(x.slice(0, Y), y, fc, fm) === 0;
}
export default isPrefix;
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