A couple of weeks ago I presented at the internal ThoughtWorks conference called XConf about how we have been treating JavaScript as a First Class Language recently on our current project. What it means to us is:

• Modularise JS code (JAWR helps)
• Unit test it. (we use Jasmine and JSTestDriver)
• Static analysis, “checkstyle for JS”. (we use JSHint)
• JS Dependency Injection to facilitate testing

Here are the slides with more info and some code samples.