Deep Dive into React Hooks

React Hooks have revolutionized the way we write React components. Let's explore the most important hooks and best practices.

useState Hook

The useState hook is the foundation of managing state in functional components.

const [count, setCount] = useState(0);

function increment() {
  setCount(count + 1);
}

useEffect Hook

useEffect allows you to perform side effects in functional components. It runs after every render by default.

useEffect(() => {
  // Side effect code here
  console.log('Component mounted or dependencies changed');
  
  return () => {
    // Cleanup function
    console.log('Cleanup');
  };
}, [dependencies]);

useContext Hook

Share state across multiple components without prop drilling using Context API.

Custom Hooks

Create reusable logic by building custom hooks.

function useCustomHook() {
  const [state, setState] = useState(null);
  
  useEffect(() => {
    // Custom logic here
  }, []);
  
  return [state, setState];
}

useCallback and useMemo

Optimize performance by memoizing functions and values to prevent unnecessary re-renders.

const memoizedCallback = useCallback(() => {
  doSomething(a, b);
}, [a, b]);

const memoizedValue = useMemo(() => {
  return expensiveCalculation(a, b);
}, [a, b]);

Rules of Hooks

Always remember the rules of hooks:

Mastering hooks will make you a more effective React developer and allow you to write cleaner, more efficient code.