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Callback Functions

A function handed to other code to be invoked later — on an event, a timer, or completion of async work. The caller decides when and how many times it runs, which is why the values a callback captures at creation time matter.

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Callback Functions in JavaScript

A callback is a function passed as an argument to another function, which invokes it upon completion of its own work, relying on the principle that functions are first-class citizens and can therefor…