update state in useState hook
// declare state using useState hook.
// someState is set to someInitialState
const [someState, setSomeState] = useState(someInitialState);
// setSomeState updates the current state
setSomeState(someOtherState);update state in useState hook
// declare state using useState hook.
// someState is set to someInitialState
const [someState, setSomeState] = useState(someInitialState);
// setSomeState updates the current state
setSomeState(someOtherState);update useState using function
function DelayedCount() {
const [count, setCount] = useState(0);
const handleClickAsync = () => {
setTimeout(function delay() {
setCount(count => count + 1); }, 3000);
}
return (
<div>
{count}
<button onClick={handleClickAsync}>Increase async</button>
</div>
);
}react usestate functional update
() => setCount(prevCount => prevCount - 1)Copyright © 2021 Codeinu
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