Grokking Advanced JavaScript
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JavaScript - Callback Functions
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In JavaScript, a callback function is a function that is passed as an argument to another function and is executed after a certain operation or event. Callbacks are foundational for handling asynchronous operations in JavaScript, allowing programs to continue running without waiting for long tasks to complete. They are extensively used for event handlers, asynchronous I/O (like reading files or requesting data from a server), and whenever operations need to occur after something else has finished.

Why Use Callback Functions?

Callback functions are essential for:

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