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More complexly put: In JavaScript, functions are objects. Because of this, functions can take functions as arguments, and can be returned by other functions.

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All I need to do is to execute a callback function when my current function execution ends. … A consumer for this function should be like this: … How do I implement this?

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Fundamentals of Callback function in javascript explained - How to pass functions as parameters. - understanding callback hell - use of callback functions.

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Callback Functions are functions that are passed as arguments to other function. - Example (see the comments in code)

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Javascript Functions. Posted on: December 26, 2016 by Dimitar Ivanov.

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A JavaScript Callback Function is a function that is passed as a parameter to another JavaScript function, and the callback function is run inside of the function it was passed into. JavaScript Callback Functions can be used synchronously or asynchronously.

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A function is a JavaScript procedure—a set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it.

  developer.mozilla.org

A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, and dollar signs (same rules as variables). The parentheses may include parameter names separated by commas: (parameter1...

  www.w3schools.com

(Learn JavaScript Higher-order Functions, aka Callback Functions). In JavaScript, functions are first-class objects; that is, functions are of the type Object and they can be used in a first-class manner like any other object (String, Array, Number, etc.) since they are in fact objects themselves.

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The callback function itself is defined in the third argument passed to the function call. That code has another alert message to tell you that the callback code

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