Function isFunction

controlled-and-uncontrolled/src/App.tsx:35–37

(value: unknown)

  const mergedValue = propsValue === undefined ? stateValue : propsValue;

  function isFunction(value: unknown): value is Function {
    return typeof value === 'function';
  } 

  const setState = useCallback((value: SetStateAction<T>) => {
    let res = isFunction(value) ? value(stateValue) : value