Higher Order Functions
A higher order function is a function that takes a function as an argument or returns a function.
Let's look at some common examples.
Callback functions are arguments passed to a function that are then called when some action or event occurs.
node, and React Native.
Some functions accept several callback functions for handling different actions.
We've already seen many standard library examples, like
reduce. Here's an example of how we might write
Higher order functions like