🪝 Advanced Hook Patterns

Complex Hook patterns for replacing all class lifecycle functionality.

Custom Lifecycle Hooks

function useLifecycle({ onMount, onUpdate, onUnmount, deps }) {
  const isFirst = React.useRef(true);

  React.useEffect(() => {
    if (isFirst.current) {
      onMount?.();
      isFirst.current = false;
    } else {
      onUpdate?.();
    }
    return () => onUnmount?.();
  }, deps);
}

Memoization Pattern

const Memoized = React.memo(Component, (prev, next) => {
  return prev.id === next.id;
});

function Parent() {
  const handler = React.useCallback(() => {}, []);
  return <Memoized id={1} onSelect={handler} />;
}

✅ Key Takeaways

• Create **custom hooks** for complex patterns

• Use **useMemo** and **useCallback**

• Combine with **React.memo**

• Profile to verify optimizations