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. Define a function called callback which receives an argument and prints it out. learn-js.org is a free interactive JavaScript tutorial for people who want to learn JavaScript, fast. 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.
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