If you're confused about how closures in JavaScript cause memory leaks in Internet Explorer, this is for you: Leak Free Javascript Closures. Then, without leakage, you can write code like this:

function attach()
{
  var element = document.getElementById("my-element");
  element.attachEvent("onclick", function()
    {
      alert("Clicked: " + this.innerHTML);
    }.closure(element));
}

Also if you want to do something like this: setTimeout(obj.method, 1000), and you find out that inside the method this is not obj, you can now do this: setTimeout(obj.method.closure(obj), 1000) to fix it.