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

Array.prototype.clear = function()
{
	this.length = 0;
	return this;
};

Array.prototype.remove = function(value) {

	var index = this.indexOf(value);
	if(index > -1) {
		this.splice(index, 1);
	}

	return this;
};