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 ...

I assigned an animals variable to an array with objects, each object has a list of properties with key - values. A method that populates a new array with results from a function called on every ...