Closure in action

closure.js

(function () {
  "use strict";

  function level1() {
    var a = 'hello';

    function level2() {
      console.log(a);

      setTimeout(function () {
        console.log(a);
      }, 100);

      a = 'goodbye';
    }

    a = 'peekabo';

    setTimeout(function () {
      console.log(a);
    }, 200);
  }

  level1();
}());

Hi AJ. Will be "coming at you live" from http://blog.binarymist.net/2014/05/31/javascript-closures/ on that date also. Well worth checking out if anyone wants a deep dive on JavaScript closures.