JavaScript is the most in-demand programming language for developer jobs and one of the most versatile languages for full-stack development. Here's what you need to know about JavaScript.

Now programming tools are often a means to another end--encouraging programmers to produce the software that will make Windows or the Palm Pre useful and therefore popular, for example.

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.