Javascript automatic getter/setters (John Resig Book)

Question

I\'m reading \"Pro Javascript Techniques\" from John Resig, and I\'m confused with an example. This is the code:

// Create a new user object that accepts an          


        

Answer 1

I started this post with the sole purpose of learning why that things happened, and I finally did. So in case there's someone else interested in the "whys" here they are:

Why does 'this' changes inside the anonymous function?

A new function, even if it is an anonymous, declared inside an object or another function ALWAYS CHANGES THE SCOPE, in this case returning to the global scope (window)

Solution: all stated in the post, I think the clearer is executing the anonymous function with .call(this)

Why getname() always returns the age?

While the anonymous function gets executed right away, the getters/setters get executed for the first time when they are called. In that moment, the value of i will always be the last because it has already iterated for all the properties... and will always return properties[i] which is the last value, in this case the age.

Solution: save the i value in a variable like this

 for ( i in properties ) { (function(){ 
  var j = i
  //from now on use properties[j]

That's basically it, if I'm wrong in anything I said please correct me, since I'm trying to learn this...

Thanks again.