React quiz: spot a bug

A few month ago I've posted this trick snippet on Twitter... And then I even forgot what the problem was myself!

const [tokenize, setTokenize] = useState(null)
const someTokenizeFunction = () => null
useEffect(() => {
  setTokenize(someTokenizeFunction)
}, [])

Can you spot a bug? Write in the comments!

Could make a nice interview question, huh?

Comments

[Aleksandrs Larionovs]

a bit late to the party but...someTokenizeFunction returns null instead of new state

[Dmitri Pisarev 🇷🇺]

Correct! In that case it treats someTokenizeFunction as a state setter and not as a state in itself.