PS React 1

ps-react-1.js

class Button extends React.Component {  
  handleClick = () =>  {
  	this.props.onClickFunction(this.props.incrementValue);
  };
  
	render() {
		return (
    	<button 
      	onClick={this.handleClick} >
      	+{this.props.incrementValue}
      </button>
    );
	}
}

const Result = (props) => {
	return (
  	<div>{props.counter}</div>
  ); 
};

class App extends React.Component {
	state = { counter: 0 };
  
  incrementCounter = (incrementValue) => {
  	this.setState((prevState) => ({
    	counter: prevState.counter + incrementValue
    }));
  };
  
	render() {
  	return (
    	<div>
      	<Button incrementValue={1} onClickFunction={this.incrementCounter} />
      	<Button incrementValue={5} onClickFunction={this.incrementCounter} />
      	<Button incrementValue={10} onClickFunction={this.incrementCounter} />
      	<Button incrementValue={100} onClickFunction={this.incrementCounter} />
        <Result counter={this.state.counter} />
      </div>
    )
  }
}

ReactDOM.render(<App />, mountNode);