react redux counter tutorial

1import React from 'react';
2
3class Counter extends React.Component {
4  state = { count: 0 }
5
6  increment = () => {
7    this.setState({
8      count: this.state.count + 1
9    });
10  }
11
12  decrement = () => {
13    this.setState({
14      count: this.state.count - 1
15    });
16  }
17
18  render() {
19    return (
20      <div>
21        <h2>Counter</h2>
22        <div>
23          <button onClick={this.decrement}>-</button>
24          <span>{this.state.count}</span>
25          <button onClick={this.increment}>+</button>
26        </div>
27      </div>
28    )
29  }
30}
31
32export default Counter;
33