Array.prototype.js

Array.prototype.js

Array.prototype.insert = function(index, item) {
    this.splice(index, 0, item);
};


/***
 * var swapTest=['a','b','c'];
 * swapTest.swap('a','c')
 * @param {type} first
 * @param {type} second
 * @returns {undefined}
 */
Array.prototype.swap = function(first, second) {
    var firstIdx;
    var secondIdx;
    for (var i = 0; i < this.length; i++) {
        if (this[i] === first) {
            firstIdx = i;
            break;
        }
    }
    for (var i = 0; i < this.length; i++) {
        if (this[i] === second) {
            secondIdx = i;
            break;
        }
    }
    if (firstIdx === undefined || secondIdx === undefined)
        throw "Swap Exception";
    var tmp = this[firstIdx];
    this[firstIdx] = this[secondIdx];
    this[secondIdx] = tmp;
};