Callbacks
Callbacks & Callback Hell
Section titled “Callbacks & Callback Hell”Introduction
Section titled “Introduction”A callback is a function passed as an argument to another function to be executed later. Callbacks were the original async pattern in JavaScript.
Topics Covered
Section titled “Topics Covered”- Callback Pattern — How callbacks enable async operations
- Callback Hell — The pyramid of doom and how to escape it
- Error-First Callbacks — The Node.js callback convention
Learning Objectives
Section titled “Learning Objectives”- Understand callback functions and their role in async programming
- Recognize callback hell and its problems
- Master the error-first callback pattern
Summary
Section titled “Summary”Callbacks are the foundation of all async patterns in JavaScript. While they work for simple cases, they lead to callback hell for complex sequences — which Promises solve.