Well, this.initialize.apply means what follows; "this" obviously is a reserved word.

DailyJS: Let's Make a Framework: OO Part 2:

Last week I was parading around initialize as if you were intimately familiar with prototype.js or Ruby. I apologise for that. In case I confused you, all you need to know is initialize is our way of saying call this method when you set up my class.

Turing’s Class.create method sets up classes. During the setup it defines a function that will be called when the class is instantiated. So when you say new, it will run initialize. The code behind this is very simple:

  create: function() {
var methods = null,
parent = undefined,
klass = function() {
this.initialize.apply(this, arguments);