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📚 Colocation matters. Cognitive load matters. Boundaries matter. High cohesion matters. Yes, even in the age of AI (maybe even more so). Enter the vertical codebase:

tkdodo.euThe Vertical CodebaseLet's take a look at why the common, horizontal code structure is not ideal, where it breaks down, and what we can do about it.

Arnaud Barré

@arnaud-barre.bsky.social

13 Apr

I still have a hard time convincing people that putting `handleClick` or `handleChange` outside of JSX doesn't make the code more readable. People are so attached to dividing things in a way that is simple, instead of putting the effort into the more delicate but useful product split

Dominik 🔮

@tkdodo.eu

Agree, the thing that's mostly stopping adoption is that getting is right is harder and you have to stop and think a bit. Also AI has learned the horizontal split and will likely default to it.

13/4/26, 3:42 pm0 reposts1 like

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