Michael Mahemoff runs into a problem with Protypes $$ function when looking for class names. Its taking over 90 seconds when more than 100 matches are returned. The advice is: Avoid $$(".classname") on large DOMs.
An explanation of scope in terms of an execution context and scope chain. Also describes how we can alter the this reference using apply and call.
An overview of object literals and object oriented programming, referencing attributes and functions, prototype objects, creating singletons.