Interview question

How do you handle state in class components? Class components में state कैसे handle करते हैं?

Answer

class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = { count: 0, name: 'John' };
  }
  
  // Update state
  increment = () => {
    this.setState({ count: this.state.count + 1 });
  }
  
  // Multiple updates
  handleChange = (e) => {
    this.setState({ name: e.target.value });
  }
  
  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
        <p>Name: {this.state.name}</p>
        <button onClick={this.increment}>Increment</button>
      </div>
    );
  }
}

Constructor में initialize करो:
this.state = { count: 0 };

SetState से update करो:
this.setState({ count: this.state.count + 1 });

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