Many people get tripped up by the this keyword in JavaScript. I think theconfusion comes from people reasonably expecting this to work like “this”does in Java or the way people use “self” in Python. Although this issometimes used to similar effect, it’s nothing like “this” in Java or otherlanguages. And while it’s a little harder to understand, its behavior isn’tmagic. In fact, this follows a relatively small set of simple rules. Thispost is an explanation of those rules.But first, I want to give some terminology and information about Ja...

Over the years, I’ve come to hold some strong. opinions on testing, testers and the entire business of quality assurance. Inspired by this post on Facebook’s testing, I wanted to write this down so I can point people to it. Some of this is controversial. In fact, even mentioning some of this in conversation has caused people to flip the bozo bit on me.Most product teams don’t need a separate testing role. And even if they do, the ratio of full time dev:full time test should be in the order of >20:1. For evidence, look no further than some of the most successful engineer...