This example shows how you create a closure which uses an alert function that can be incremented and reused/passed around.

  • In the console call funcStorer() and you will see the counter increment.
  • Then call funcStorer2() and you will see a seperate counter increment.
  • The variable x is private to the closureAlert function.
  • When funcStorer is called closureAlert runs, it returns alerter.
  • When functStorer is called again it doesn't call closureAlert again it calls what it returns alerter.
  var closureAlert = function() {
  var x = 0;
  var alerter = function() {
  return alerter;

var funcStorer = closureAlert(); // reference to alerter();
var funcStorer2 = closureAlert(); // second seperate reference to alerter();

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