class SomeComponent extends React.Component {

  constructor(){

    super();

    this.state = { posts: [] };

  }

  loadPosts() {

    fetch('https://jsonplaceholder.typicode.com/posts')

      .then(response => response.json())

      .then(posts => {

        this.setState({ posts: posts })

      })

  } 

  renderPosts() {

    return this.state.posts.map(post => {

      const { id, title, body } = post;

      return (

        <div key={id}>

          <h5>{title}</h5>

          <p>{body}</p>

        </div>

      )

​

    })

  }

​

  render() {

    return (

    <div>

      <h2>My posts</h2>

      <ul>

       {this.renderPosts()}

      </ul>

​

      <button onClick={() => this.loadPosts()}>Load post</button>

    </div>

    );

  }

}

​

ReactDOM.render(

  <SomeComponent />,

  document.getElementById('container')

);