Some Array Methods

Array.prototype.each = function(fn, scope) {
	var count = 0;
	while(count < this.length) {
		fn.call(scope || window, this[count], count)
		count++;
	}
};

Array.prototype.search = function(fn) {
	var result = [];
	var count = 0;
	while(count < this.length) {
		if(fn(this[count])) {
			result.push(this[count]);
		}
		count++;
	}
	return result;
};


Array.prototype.collect = function(fn, scope) {
	var result = [];
	var count = 0;
	while(count < this.length) {
		result.push(fn.call(scope || window, this[count]));
		count++;
	}
	return result;
};

Array.prototype.aggregate = function(fn) {
	var result = 0;
	var count = 0;
	while(count < this.length) {
		result += fn(this[count]);
		count++;
	}
	return result;
};

Array.prototype.contains = function(item) {
	return this.indexOf(item) != -1;
};

Array.prototype.first = function() { 
	return this[0] 
};
Array.prototype.last = function() { 
	return this[this.length - 1]
};