Closures in JavaScript

gistfile1.js

/* 
  Allows you to declare functions within functions.
  The functions are expressed rather than declared, as in the myClosure function expression below:
*/

function myFunction() {
  var myClosure = function() { alert hello;};
  return myClosure;
}


/*
  What's really tricky about this is that the anonymous functions that are being passed around
  don't execute until they are called. Thus, variables that have been set outside of the
  anonymous function can be accessed, but they will always be the final assigned value.
*/

function myFunction(anArray) {
  var closures = [];
  for(var i1 = 0; i1 < anArray.length; i1++){
    var myClosure = function() { alert("Value: " + i1);};
    closures.push(myClosure);
  }
  return closures;
}

/*
  Note that myFunction returns a collection of functions. These functions have not yet been executed--
  in fact, they can be passed around to be executed later. In order to execute the closures returned by
  myFunction, the call would look like this:
*/

var closures = myFunction([1,2,3]);
for (var i2 = 0; i2 < closures.length; i2++) {
  closures[i]();
}

/*
  Because i1 was incremented before the closure actually executed, the following text
  will be alerted three times:
*/
    "Value: 3"