Difference between window[] and eval() - Javascript

Question

I\'ve been using both in javascript ... really don\'t know the difference. Googling always shows results for the \"window object\" or \"opening a new window in javascript\"

Answer 1

Another point that has not been addressed is that eval will resolve the variable reference using the caller variable environment, for example:

var foo = "global";

(function () {
  var foo = "local";
  alert(eval("foo")); // alerts "local"
  alert(window["foo"]); // alerts "global"
})();

So as you can see, is not completely equivalent.

If you simply want to reference a global variable, I would recommend you to use the window[prop] approach and avoid surprises.