Function throttling Vanilla JS

function.thorttle.js

Function.prototype.throttle = function(delay) {
	var outter = this,
		timer, control = false;
	
	return function() {
		
		if (control) return;
		
		control = true;
		var inner = this,
			args = [].slice.apply(arguments);
		
		clearTimeout(timer);
		timer = setTimeout(function() {
			control = false;
			outter.apply(inner, args);
		}, delay);
		
	};

};