Callbacks

Acknowledgements and Callbacks

Learn how Socket.IO acknowledgements let the sender of an event know it was received and processed, turning fire-and-forget emits into request/response style c…

Callbacks and Asynchronous JavaScript

Learn how JavaScript handles operations that take time using callback functions, and why deeply nested callbacks lead to callback hell.

Callbacks in Node.js

How Node.js uses callback functions to handle asynchronous operations without blocking the main thread.

map, filter, and reduce: How Do They Differ?

map transforms every element into a new array of the same length, filter selects a subset of elements into a new (possibly shorter) array based on a predicate,…