Eight Weeks of Prototype: Week 3, Prototype Data Types
Most of the methods in the Enumerable accept an extra argument, used to define the context of the iterator method. Essentially what this does it define what the keyword
this refers to when used inside of the iterator.
While this is an extremely important concept in development with Prototype, it is generally only relevant when developing your own classes in Prototype. I will discuss object binding further in the sixth part of this article series.