Google’s Closure compiler, for optimizing and transpling JavaScript, no longer needs Java to run. Instead, Java source code is compiled to JavaScript so it can run under Node.js or in a browser.

The trick to mastering JavaScript is knowing when and how to use some of its more idiosyncratic patterns and constructs. Get coding tips for using closures, inheritance, and more in JavaScript.

The library, called Closure, includes an extraordinarily diverse assortment of capabilities with functionality ranging from JSON serialization to standard user interface widgets.