What are the lifecycle methods of a React class component?

Main lifecycle methods of a React class component:

• constructor(props) — initializes state and binds methods.
• componentDidMount() — called after the component is mounted, suitable for data loading.
• shouldComponentUpdate(nextProps, nextState) — allows optimizing re-rendering by returning true/false.
• componentDidUpdate(prevProps, prevState) — called after the component updates.
• componentWillUnmount() — cleans up resources before the component is removed.

Example:

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = { count: 0 };
  }

  componentDidMount() {
    console.log('Component mounted');
  }

  shouldComponentUpdate(nextProps, nextState) {
    return nextState.count !== this.state.count;
  }

  componentDidUpdate(prevProps, prevState) {
    console.log('Component updated');
  }

  componentWillUnmount() {
    console.log('Component will be unmounted');
  }

  render() {
    return <div>{this.state.count}</div>;
  }
}