Callbacks were the only natively supported way to deal with async code in JavaScript until 2016 ... coordinating multiple asynchronous functions. For example, if we wanted to wait two seconds ...

Node.js is a lean, fast, cross-platform JavaScript runtime environment that is useful for both servers and desktop applications. Scalability, latency, and throughput are key performance indicators ...

However, there still exists Javascript API that requires you to pass in callback accepting functions. For example, ExpressJS requires middleware functions to be plain old functions that accept a next ...

Specifically, TypeScript ensures you create reliable code when implementing callback functions. In last month's column, I walked through the two syntaxes for defining "function datatypes" in ...