The rise of Ajax and Rich Web Applications, plus the success of dynamic languages, has caused people to revisit the JavaScript language. Now that we take JavaScript seriously as a language, it is time to get serious about the quality of JavaScript code, through refactoring. In this talk, we will approach refactoring JavaScript in three phases:

• Test first, then refactor. Bring JavaScript code under test, so that you can refactor with confidence.
• Refactoring 101. Explore some important refactorings: composed method, extract method, introduce named parameter, and extract object
• Common problems. Work through three problems endemic to legacy JavaScript code: making JavaScript unobtrusive, refactoring to prototype-based inheritance, and refactoring to functional style.