Web Reference: May 5, 2009 · A callback function, also known as a higher-order function, is a function that is passed to another function as a parameter, and the callback function is called (or executed) inside the parent function. In computer programming, a callback is a programming pattern in which a function reference is passed from one context (consumer) to another (provider) such that the provider can call the function. 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.
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