Implementing useDebounce Custom Hook
Build a useDebounce hook that delays state updates until the user stops typing.
Hook Signature
The useDebounce hook accepts a value and a delay in milliseconds, and returns a debounced version of that value: function useDebounce(value, delay). The returned debouncedValue lags behind the real value, updating only after the specified delay has elapsed without another change.
Internal State for debouncedValue
Inside the hook, declare a state variable: const [debouncedValue, setDebouncedValue] = useState(value). This state holds the last committed value. It starts equal to the initial value and only updates after the debounce timer fires. Components that read debouncedValue see a stable, settled input.
All lessons in this course
- Why Debounce and Throttle Matter in UIs
- Implementing useDebounce Custom Hook
- Implementing useThrottle Custom Hook
- Practical Applications: Search, Scroll, Resize