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. Jul 23, 2025 · In JavaScript, a function is comparable to a procedure—a series of words that performs a task or calculates a value—but for a process to qualify as a function, it must accept some input and produce an output with a clear link between the input and the result. Want to learn all about JavaScript functions? Learn how to write a function, how to use it, and why you should use them in your JavaScript code today!
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