Callback Function

Read more details about Callback Function from the following web site:

Couple of lines from the above site "A callback function, also known as a higher-order function, is a function that is passed to another function (let's call this other function "otherFunction") as a parameter, and the callback function is called (or executed) inside the otherFunction."

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http://javascriptissexy.com/understand-javascript-callback-functions-and-use-them/