Examples of methods that use Callback Functions

Callback Examples

Several JavaScript functions already take in callbacks as arguments.

• map()

  The map() method calls a callback function on each element in the array and then returns a new array with those results.

  Notice how the map() method uses a callback function:

  

  
  

• filter()

  The filter() method removes elements in an array that do not pass a certain criteria defined by a callback function.

  Notice how the filter() method is used to remove elements in an array that are not even: