Web Reference: A JavaScript callback is a function passed as an argument to another function, which is then executed (or "called back") at a later point in time to complete a specific task. Jan 22, 2026 · Functions in JavaScript are reusable blocks of code designed to perform specific tasks. They allow you to organize, reuse, and modularize code. It can take inputs, perform actions, and return outputs. In this tutorial, we will learn to assign a function to a variable in JavaScript. Functions are reusable code blocks that can be stored in variables as expressions.
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