gistfile1.txt

import React, { PureComponent } from 'react';
import { render } from 'react-dom';

class App extends PureComponent {
    constructor(props) {
        super(props);
        this.state = {
            name: ''
        };
        this.set_name = this.set_name.bind(this);
    }

    set_name() {
        this.setState({
            name: 'Mohammad' + Math.random()
        });
    }

    render() {
        console.log('Render');

        return (
            <div>
                <h1>{this.state.name}</h1>
                <button onClick={this.set_name}>Click</button>
            </div>
        );
    }
}

render(
    <App/>,
    document.getElementById('root')
);