Suppose you’d like to perform an event when the user hovers over an item, but you’d like that event to be slightly delayed to reduce sensitivity to inadvertent mouse movements.

To solve this problem you can decompose the hover action into a mouseenter and mouseleave. Then use a setTimeout to perform your action, but cancel the timer if the mouse leaves too early.

Using an immediately invoked function closure, you can store the timer object and clear it easily like so:

(function () {
  var timer;

  function change(event) {
    var that = $(this); 
    timer = setTimeout(function() {
      // ...
    }, 200); 

  function cancel(event) {