Salesforce Lightning: debounce helper method

sfdc-lightning-debounce-helper

({
  debounce: function(func, wait, immediate) {
    var timeout;
    return $A.getCallback(function() {
      var context = this,
        args = arguments;
      var later = function() {
        timeout = null;
        if (!immediate) {
          func.apply(context, args);
        }
      };
      var callNow = immediate && !timeout;
      clearTimeout(timeout);
      timeout = setTimeout(later, wait);
      if (callNow) {
        func.apply(context, args);
      }
    });
  }
});