Array object additions

array-prototype.js

//implement shift and unshift on Array prototype
//http://www.javascriptkit.com/javatutors/oopjs2.shtml
if(!Array.prototype.shift) { // if this method does not exist..

	Array.prototype.shift = function(){
		firstElement = this[0];
		this.reverse();
		this.length = Math.max(this.length-1,0);
		this.reverse();
		return firstElement;
	}

}

if(!Array.prototype.unshift) { // if this method does not exist..

	Array.prototype.unshift = function(){
		this.reverse();

			for(var i=arguments.length-1;i>=0;i--){
				this[this.length]=arguments[i]
			}

		this.reverse();
		return this.length
	}
}