Web Reference: Mar 7, 2012 · There's two points to explain, one is how a callback works (passing around a function that can be called without any knowledge of its context), the other what it's used for (handling events asynchronously). "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. Mar 2, 2026 · After struggling, breaking my code, and fixing it again and again, this is how I finally understand callbacks. A callback is simply a function that is given to another function so it can run later — usually after some task finishes.
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