http://developer.netscape.com/docs/manuals/js/core/jsguide/obj2.htm
A detailed article explaining the prototype-based implementation of OOP, inheritance, and classes in JavaScript. Concepts are illustrated with numerous code samples. Netscape makes a special effort to explain JavaScript's OOP in terms C and Java coders will understand.
http://java.sun.com/docs/books/tutorial/java/concepts
Although intended as a primer for aspiring Java programmers, it covers the basics of OOP in generalized terms and makes good background reading for OOP in any language.
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