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I, a React developer for ~8 years, don’t really remember what useEffect does without the second param. I never needed it, so I forgot. I almost feel it should be a required prop, and I doubt that that knowledge alone would fail or pass an interview.

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One of the things about React is that local codebase conventions really influence what parts of the API are high-touch for you.

I too have been coding in React for that long (precisely that long, oddly enough ;D) and I used `useEffect()` in pretty much everything I was doing.

There are reasons for this that are local to the project I was on for most of that time.

And yeah, I'm pretty sure my embarrassing confusion cost me the interview in question.

Coding is a lot like playing a musical instrument, or singing. Without daily practice, you get musty. You can scrape off the must in a matter of days or weeks, but in the meantime, you can be expected to bomb any audition.

This is why it's so good to have something on the go on GitHub. It's not about the star-count, it's about keeping your hand in.