Postpone/Debounce a function important for showing autocomplete search results and saving ajax requests.

debounce

function debounce (delay, callback) {
 var timeout = null;
 return function (){
   if (timeout) {
     clearTimeout(timeout);
   }
   var context = this;
   var args = arguments;
   timeout = setTimeout(function(){
     callback.apply(context, args);
     timeout = null;
   }, delay)
 };
}