Components/Counter.js at master · Mercy-1998/Components · GitHub

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import React, { Component } from "react";

class Counter extends Component {
  constructor(props) {
    super(props);

    this.state = {
      count: 0
    };
  }

  increment() {
    //        this.setState({
    //            count: this.state.count + 1
    //        },
    //        () => {
    //            console.log('Callback value', this.state.count )
    //        })
    this.setState((prevState, props) => ({
      count: prevState.count + 1
    }));
    console.log(this.state.count);
  }

  incrementFive() {
    this.increment();
    this.increment();
    this.increment();
    this.increment();
    this.increment();
  }

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

export default Counter;