jsFiddle lets developers play with the three core elements of Web development. Check out this powerful application for rapid prototyping and testing.

Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

Since JavaScript is a prime suspect for websites with lousy Google rankings, it makes sense to poke around a bit and follow the Five Commandments.