Macro Rules

Metaprogramming Elixir — by Chris McCord (10 / 48)

👈 The World Is Your Playground | TOC | The Abstract Syntax Tree — Demystified 👉

Before we write more complex macros, we need to review a couple of rules to temper our expectations. Macros give us awesome power, but with great power comes great responsibility.

You may hear this rule touted loudly when talking with others about metaprogramming. Often it’s unfounded, but before we get too carried away, we have to remember that writing code to produce code requires special care. It’s easy to get caught in our own web of code generation, and many have been bitten by reckless complexity. When taken too far, macros can make programs difficult to debug and reason about. There should always be a clear advantage when we attack problems with metaprogramming. In many cases, standard function definitions are a superior choice if code generation is not required.

Metaprogramming is sometimes framed as complex and fragile. Together, we’ll dispel these myths by producing robust, clear programs that offer productive advantages in a fraction of the required code. It’s important to avoid letting the potential for abuse scare you away from fully exploring Elixir’s macro system. The best way to learn metaprogramming is to throw away your preconceived notions and explore with a curious and open mind. You can’t be afraid to be a little irresponsible while you’re learning.

It’s important to keep this duality in mind when writing macros. Along our metaprogramming journey, you’ll see how to apply your sharp skills responsibly and look at common pitfalls to avoid. Great code speaks for itself, and we’ll be writing plenty of it.

👈 The World Is Your Playground | TOC | The Abstract Syntax Tree — Demystified 👉

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