Array.prototype.swap

index.js

if (!Array.prototype.swap) {
    Object.defineProperty(Array.prototype, 'swap', {
        value: function (idxA, idxB) {
            if (this == null) {
                throw new TypeError('"this" is null or not defined');
            }

            const o = Object(this);
            const len = o.length >>> 0;
            if (len === 0) {
                return false;
            }

            if (typeof idxA !== 'number') {
                throw new TypeError('idxA must be a number')
            }

            if (typeof idxB !== 'number') {
                throw new TypeError('idxB must be a number')
            }

            const temp = o[idxA];
            o[idxA] = o[idxB];
            o[idxB] = temp;
        }
    })
}

// let arr = [1,2,3,4,5,6,7];

// arr.swap(6, 2);
// arr;