decomposing-split-component.js

const PanelHeader = (props) => (
  // ...
);

const PanelBody = (props) => (
  // ...
);

class Panel extends React.Component {
  render() {
    return (
      <div>
        // Nice and explicit about which props are used
        <PanelHeader title={this.props.title}/>
        <PanelBody content={this.props.content}/>
      </div>
    );
  }
}

@aamaclaren & future readers: Omitting curlies on arrow functions implies "return", i.e. with curlies you would need also an explicit "return" statement. Parentheses allow "line breaks" for human readers, while keeping it as one line = one statement for JS, and with only one statement you don't need curlies. Often used for code golfing, with React it supports the declarative view on components as soon as you are used to it or if you got onboarded without any JS knowledge at all.