Array Extender. Creates an Array subclass. Doing so you won't override or mess with Array's own prototype

ArrayExtender.js

var ArrayExtender = function (a) {
    var counter = 0;
    for (var i in a) {
        if (a.hasOwnProperty(i)) {
            this[i] = a[i];
            ++counter;
        }
    }
    
    this.length = counter;
};
ArrayExtender.prototype = Array.prototype;


ArrayExtender.prototype.count = function () {
    for(var i in this) {
        if (this.hasOwnProperty(i)) {
            console.log("Element "+i+" is "+this[i]);
        }
    }
};


var thisWouldWin = new ArrayExtender([123, 234]);

console.log(thisWouldWin);
thisWouldWin.count();
console.log(thisWouldWin.length);

thisWouldWin.push(345);
console.log(thisWouldWin.length);