Web Reference: "I will call back later!" 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. This mechanism is fundamental to JavaScript's event-driven and asynchronous programming model. Sep 25, 2025 · In this post, we’ll dive into the essentials of callbacks, covering what they are, the different ways to write them, and the crucial distinction between synchronous and asynchronous callbacks. Aug 20, 2025 · A callback is simply a function you pass into another function so it can be called later. While the idea is simple, using callbacks correctly helps you write clearer, more reliable code and prepares you for understanding Promises and async/await.
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