Delayed Callback

delayed_callback.js

var timeout, callback;

callback = function(event) {
    console.log("Hey!");
}

button.addEventListener('click', function(event) {
    clearTimeout(timeout);
    timeout = setTimeout(function() {
        callback(event);
    }, 300);
});

var delay = function(interval,fn){
    var timeout;
    return function(){
      var args = arguments;
      clearTimeout(timeout);
      timeout = setTimeout(function() {
          fn.apply(undefined,arguments);
      }, interval);
    }
};

button.addEventListener('click', delay(300, function(event) {
    console.log("Hey!");
}));