Implementing an if Statement

Introduction

Have you ever felt frustrated that a language didn’t have just the right feature for some code you were writing? Or have you found yourself repeating chunks of code that weren’t amenable to factoring into functions? Have you just wished you could program closer to your problem domain?

If so, then you’ll love this chapter.

But before we get into the details, here’s a warning: macros can easily make our code harder to understand because we’re essentially rewriting parts of the language. For that reason, we never use a macro when we could use a function. Let’s repeat that:

Warning: ...