code quality

Learn the basics of ESLint, the most popular JavaScript linter that can help you adhere to syntax conventions, identify potential problems in your code, and enforce a set of standards defined by you or your team. What is a Linter? A linter is a tool that identifies issues in your code. When you run a linter against your code, it can tell you if your code follows specific syntax conventions, contains potential sources of problems, and matches a set of defined standards....

In older code, you may come across a situation where undefined is intentionally passed to a function. Why was this done? I stumbled upon this interesting technique while watching the well-known Paul Irish video about the jQuery source code. This video is from a different era, being 9 years old at the time of writing, and the jQuery source code has since changed, so you won’t find this trick in there anymore....