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Function on variable change

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WhyFencePost (Ping Reply) posted this in #help-forum
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WhyFencePost (Ping Reply)OP
Is there a next event listener for onVariableChange, so that I can run a function every time a specific variable changes?
Answered by riský
yeah useEffect ALSO if you make a function and make it as input, the function should just rerun too

i hope this helps, but i havent tested and made on discord:
const [a, setA] = useState()
function fn(v) {
  return `hi: ${v}`
}

// `yes` should be updated on a's change
const yes = fn(a)

return <button onClick{(() => setA(Math.random()))} />
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2 Replies

riský
yeah useEffect ALSO if you make a function and make it as input, the function should just rerun too

i hope this helps, but i havent tested and made on discord:
const [a, setA] = useState()
function fn(v) {
  return `hi: ${v}`
}

// `yes` should be updated on a's change
const yes = fn(a)

return <button onClick{(() => setA(Math.random()))} />
Answer