‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful!

Higher-order functions refer to those that consume or produce other functions. Methods on the function prototype, such as call and bind, are both higher-order functions.

Let's look at each of these in more detail. Functions are first-class citizens In functional programming, functions are treated as first-class citizens. Functional programming supports higher-order ...