If you write JavaScript, you have probably used higher-order functions and not even noticed. If you have ever replaced a for loop with an array method, you’ve used higher-order functions.

In the past two columns, we’ve looked at higher-order functions and talked a little bit about the power of functional programming. So far, the concepts we’ve covered do little to indicate how ...

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 ...