Web Reference: What is a Callback Function? A callback function is a function passed as an argument into another function. A callback function is intended to be executed later. Later is typically when a specific event occurs or an asynchronous operation completes. Jan 17, 2026 · A callback function is a function that is passed as an argument to another function and executed later. A function can accept another function as a parameter. Callbacks allow one function to call another at a later time. A callback function can execute after another function has finished. Jul 3, 2024 · You can do this using JavaScript's callback functions, which showcase JavaScript's ability to handle asynchronous operations. Let's explore what callback functions are, how they work, and why they're essential in JavaScript.
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