Callbacks are normally passed into a function and provides the developer with the flexibility to change the callback code without having to modify the calling function. For example, callbacks are ...

The callback function accepts a Customer object and returns a string. Listing 1 shows the code that both defines the variable and assigns a function to the variable to it using the JavaScript-like ...

Sometimes you need a little snippet of code that you only need in one place — most commonly, as a callback function to pass another function — so why bother giving it a name?