JavaScript functions are executed in the sequence they are called.Not in the sequence they are defined. This example will end up displaying "Goodbye": This example will end up displaying "Hello": See more

Using a callback, you could call the calculator function (myCalculator)with a callback (myCallback), and let the calculator function run the callback after the calculation is finished: In the example above, myDisplayer is a called a callback function. It is passed … See more

Sometimes you would like to have better control over when to execute a function. Suppose you want to do a calculation, and then display the result. You could call a calculator function … See more

The examples above are not very exciting. They are simplified to teach you the callback syntax. Where callbacks really shine are in asynchronous functions, where one function has to wait for another function (like waiting for a file to load). Asynchronous … See more