Batched Updates in React

Demonstrate how React batches multiple `setState` calls into a single update for performance optimization.

import React, { Component } from 'react';

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

  increment = () => {
    // Below are two state update calls that React will batch together
    this.setState({ count: this.state.count + 1 });
    this.setState({ count: this.state.count + 1 });
  };

  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
        <button onClick={this.increment}>Increment</button>
      </div>
    );
  }
}

export default Counter;

In this code snippet, we have a React class component with a 'count' state. The 'increment' method has two consecutive 'setState' calls. React will automatically batch these updates into a single re-render for performance optimization. Clicking the 'Increment' button will only increment the count by 1 due to the batching effect.