API

const BlogTitle = ({ children }) => (
  <h3>{children}</h3>
);
// class component
class BlogPost extends React.Component {
  renderTitle(title) {
    return <BlogTitle>{title}</BlogTitle>
  };
  render() {
    return (
    <div className="blog-body">
      {this.renderTitle(this.props.title)}
      <p>{this.props.body}</p>
    </div>
    );
  }
}