IBM Developerworks, Written by Kris Hadlock
Gain a foundational understanding of the intrinsic objects available in the JavaScript language. All programming languages have intrinsic (or built-in) objects that create the essential functionality of the language. Intrinsic objects are the foundation of the language in which you write custom code that powers custom functionality based on your imagination. JavaScript has many intrinsic objects that define it as a language. This article covers some of the most commonly used objects and provides a basic understanding of what the functions are and how to use them.
Read the original article at IBM Developerworks