08May

“Clean Code” is the code smell of a missing language feature.

Posted by Elf Sternberg as Uncategorized

Uncle Bob has a passage early in his book where he criticizes the function below, calling it “too long” and “missing context”. I agree that it’s cluttered and hard to read, but his representative solution is, frankly, absurd. He turns this into a C++ class with static methods for providing the modifiers to the text, all the while ignoring the huge elephant in the code: it does two things.

Here’s how you should write this code:

This is a look-up table. That’s all it is; using an algorithmic guide, you’re looking something up, translating one thing into another. Formatted this way, this is shorter, more readable, and more extensible. This version is a little performance and memory-wonky, using the format() macro twice and string-ifying statics, but worrying about that is a premature optimization waiting to take root; as it is, this function pair is literally an ideal until profiling tells you otherwise.

And while I’m being snarky about using a grown-up language, there’s nothing in C++ that says you couldn’t achieve the same results. Rust’s match is nothing more than a switch statement turned into an expression and using the move-semantic to avoid memory leaks. C++ has both lambda expressions and move semantics. Java, as of Java 9, has tuples and lambdas and garbage collection. Go is, well, Go; you get what you pay for.

I’m not asking for much. I just want you to stop writing code like it’s 1998.. I was there. It wasn’t fun. Writing code isn’t a privilege, and lots of extra lines isn’t extra value, it’s extra liability.

Oh, notice something else? My version separates the formatting from the printing: it can be tested. Write the tests first.

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