Producing a quality product is always going to require extensive and repeated testing; this is exactly the sort of thing computers are really good at. Automate as much as possible.

Testing JavaScript code is an up-and-coming thing. The tooling around, mocking out objects, and even the tools for running tests are undergoing constant changes. Being able to use tools such as Node.js to run tests quickly and without having to boot up an entire browser is stunningly helpful. This is an area that is only going to improve over the next few years. I am enthused to see what changes come from it.

In the next chapter we'll take a look at some advanced patterns in JavaScript that you might not want to use every day but are very handy.