However, JavaScript developers had been implementing ... Asynchronous functions that use callbacks take a function as a parameter, which will be called once the work completes.

Using reduce() in place of filter().map() In JavaScript, we use the filter method to filter items stored in an array using a callback. We use the map method to create a new array using the old ...

It runs a single-threaded event loop registered with the system to handle connections, and each new connection causes a JavaScript callback function to fire. The callback function can handle ...