Introduction

The ancient Greek poet Archilochus wrote, “A fox knows many things, but a hedgehog one important thing.” The great historian Isaiah Berlin said all thinkers are either hedgehogs or foxes. I think the same is true of syntax.

As you’ve seen, const is a hedgehog. It can only do one thing—make an unchanging declaration. By only doing one thing, it makes your code readable and predictable. As you’ll see in upcoming tips, array methods are all hedgehogs. They can do only one thing on an array. But they do it well, so you can safely predict outcomes without diving into the details. ...