javascript debounce function

debounce.js

// call func after a defined interval of time
var debounce = function( func, wait ) {
	var timeoutId = null;

	// set default interval time
	wait = wait || 200;

	return function() {
		var args = arguments,
		    context = this;

		window.clearTimeout( timeoutId );

		timeoutId = window.setTimeout( function() {
			timeoutId = null;

			func.apply( context, args);
		}, wait );
	};
};

// remember: debounce() will return a function to call "func", so you have to call this debounce() function eventually!
var oldFunc = function(){ 
  // ...
};

var newFunc = debounce( oldFunc, 1000 );

// now you can bind this new function to an event:
$domObj.on("keydown", newFunc );


// reference: http://stackoverflow.com/questions/24004791/can-someone-explain-the-debounce-function-in-javascript