@extra-array/has-key/index.js

Checks if array has a key.

'use strict';

/**
 * Checks if array has a key.
 * @param x an array
 * @param k key?
 */
function hasKey(x, k = 0) {
    var X = x.length;
    return k >= -X && k < X;
}

module.exports = hasKey;