dev.to - 1

setState.js

import React,{Component } from "react";
import "./styles.css";

export default class App extends Component {
  state = {
    count: 0
  }
  handleClick = () => {
    this.setState({
      count: this.state.count+1
    })
    console.log(this.state.count)
  }
  render() {
    return (
      <div className="App">
        <h1>{this.state.count}</h1>
        <button onClick={this.handleClick}>+</button>
      </div>
    );
  }
}