React Hooks are a feature that enables you to use state and other React features without writing a class. Hooks are functions that let you "hook into" React state and lifecycle features from function components.

Why Use Hooks?

  • Simpler State Management: Hooks make it easier to manage state and side effects within your components.
  • No More Classes: You can use Hooks without writing a class, making your components simpler and more intuitive.
  • Consistent Experience: Hooks provide a consistent API across all React components, making it easier to share code and collaborate.

Common Hooks

Here are some of the most commonly used Hooks:

  • useState: Allows you to add React state to function components.
  • useEffect: Enables you to perform side effects in function components.
  • useContext: Provides access to a React context value.
  • useReducer: Allows you to use the useReducer hook instead of useState for more complex state logic.
  • useCallback: Memoizes a callback.
  • useMemo: Memoizes a value.

useState

The useState hook allows you to add React state to function components. It takes a state variable and a function to update it as arguments.

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

To update the state, you can call setCount with the new value:

setCount(count + 1);

useEffect

The useEffect hook enables you to perform side effects in function components. It takes a function as an argument, which will be executed after every render.

useEffect(() => {
  // Perform a side effect
}, [dependencies]);

To run the effect only once after the first render, you can omit the second argument:

useEffect(() => {
  // Perform a side effect only once after the first render
});

Further Reading

For more information on React Hooks, please refer to the official documentation.

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cat