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. In this tutorial, you will learn about JavaScript callbacks and how they are used to handle asynchronous operations. Jul 23, 2025 · In JavaScript, callbacks are functions that are passed as arguments from one function to another and are executed after the completion of a certain task. They are commonly used in asynchronous operations, such as reading files, making HTTP requests, or handling user input.
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