Function debouncing Vanilla JS

function.debounce.js

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