Both useState and useReducer Hooks bail out of updates if the next value is the same as the previous one. Mutating state in place and calling setState will not cause a re-render.
Normally, you shouldn’t mutate local state in React. However, as an escape hatch, you can use an incrementing counter to force a re-render even if the state has not changed:
1 2 3 4 5 | const [ignored, forceUpdate] = useReducer(x => x + 1, 0); function handleClick() { forceUpdate(); } |
Try to avoid this pattern if possible.
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