The Mozilla Web browser provides the best free tools for debugging JavaScript code loaded into the browser. In fact, unless you are using a development environment such as ASP that includes a debugger, Mozilla is indespensible! This article provides an overview and links to detailed information and tutorials.

Many languages have a built-in trim function or method, to remove leading and trailing whitespace from a string of some sort. JavaScript, however, does not. So I wrote one and will explain how it works. Plus, I wrote two versions: one using a while loop and another one using recursion.