Every so often I open a PR and see something like this: deployFeature(flag, true, false, true); I run into it more often than I’d like. Not because it’s complicated. Just because I have no idea what I’m looking at. So I click into the function definition, scroll a bit, lose...

I used to write a lot of JavaScript like this: const result = users .filter(user => user.active) .map(user => user.name) .sort() .slice(0, 5); Nothing here is wrong. I wrote code like this all the time. But this is exactly the kind of thing that feels fine at first, then slowly...

This comes up a lot, and it’s easy to get wrong. It’s really easy to default to “lift state up” in React. I’m guilty. But that’s not always the right move. Quick rule of thumb Keep state as close as possible to where it’s actually used. Lift it when: Multiple...