In computer programming, a callback, or callback function, is any reference to executable code that is passed as an argument to another piece of code. The code that receives the callback is expected to call back (execute) the callback function as part of its job). Here are some key points about callback functions:
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Usage: Callback functions are commonly used in programming to handle events, asynchronous operations, and to control the flow of a program.
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Passing as Arguments: Callback functions are passed as arguments to other functions and are then invoked inside the outer function to complete some kind of routine or action.
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Synchronous and Asynchronous: Callbacks can be called either synchronously, immediately after the invocation of the outer function, or asynchronously, at some point later, after an asynchronous operation has completed.
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JavaScript Example: In JavaScript, a callback function can be created by passing it as a parameter to another function and then calling it back right after something has happened or some task is completed.
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Benefits: Callbacks ensure that a function does not run before a task is completed but runs right after the task has completed. They help in developing asynchronous JavaScript code and keep programs safe from problems and errors.
Overall, callback functions are a fundamental concept in programming, allowing for flexibility and control in handling various operations and events within a program.
