Understanding closure in Javascript

Question

I\'m trying to wrap my head around closures in Javascript.

Here is an example from a tutorial:

function greeter(name, age) {
  var message = name + \         


        

Answer 1

A better example may be

function add(start, increment) {
  return function() {
      return start += increment;
  }
}

var add1 = add(10, 1);

alert(add1()); // 11
alert(add1()); // 12

Here, every time you call the returned function, you add 1. The internals are encapsulated.

The returned function still has access to its parents variables (in this case, start and increment).

On a lower level of thinking, I think it means that the function's stack is not destroyed when it returns.