freeCodeCamp/curriculum/challenges/english/03-front-end-development-libraries/react/use-react-to-render-nested-components.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
5a24c314108439a4d4036165	Use React to Render Nested Components	6	301420	use-react-to-render-nested-components

--description--

The last challenge showed a simple way to compose two components, but there are many different ways you can compose components with React.

Component composition is one of React's powerful features. When you work with React, it is important to start thinking about your user interface in terms of components like the App example in the last challenge. You break down your UI into its basic building blocks, and those pieces become the components. This helps to separate the code responsible for the UI from the code responsible for handling your application logic. It can greatly simplify the development and maintenance of complex projects.

--instructions--

There are two functional components defined in the code editor, called TypesOfFruit and Fruits. Take the TypesOfFruit component and compose it, or nest it, within the Fruits component. Then take the Fruits component and nest it within the TypesOfFood component. The result should be a child component, nested within a parent component, which is nested within a parent component of its own!

--hints--

The TypesOfFood component should return a single div element.

assert(Enzyme.shallow(React.createElement(TypesOfFood)).type() === 'div');

The TypesOfFood component should return the Fruits component.

assert(
  Enzyme.shallow(React.createElement(TypesOfFood)).props().children[1].type
    .name === 'Fruits'
);

The Fruits component should return the TypesOfFruit component.

assert(
  Enzyme.mount(React.createElement(TypesOfFood)).find('h2').html() ===
    '<h2>Fruits:</h2>'
);

The TypesOfFruit component should return the h2 and ul elements.

assert(
  Enzyme.mount(React.createElement(TypesOfFood)).find('ul').text() ===
    'ApplesBlueberriesStrawberriesBananas'
);

--seed--

--after-user-code--

ReactDOM.render(<TypesOfFood />, document.getElementById('root'))

--seed-contents--

const TypesOfFruit = () => {
  return (
    <div>
      <h2>Fruits:</h2>
      <ul>
        <li>Apples</li>
        <li>Blueberries</li>
        <li>Strawberries</li>
        <li>Bananas</li>
      </ul>
    </div>
  );
};

const Fruits = () => {
  return (
    <div>
      { /* Change code below this line */ }

      { /* Change code above this line */ }
    </div>
  );
};

class TypesOfFood extends React.Component {
  constructor(props) {
    super(props);
  }

  render() {
    return (
      <div>
        <h1>Types of Food:</h1>
        { /* Change code below this line */ }

        { /* Change code above this line */ }
      </div>
    );
  }
};

--solutions--

const TypesOfFruit = () => {
  return (
    <div>
      <h2>Fruits:</h2>
      <ul>
        <li>Apples</li>
        <li>Blueberries</li>
        <li>Strawberries</li>
        <li>Bananas</li>
      </ul>
    </div>
  );
};

const Fruits = () => {
  return (
    <div>
      { /* Change code below this line */ }
        <TypesOfFruit />
      { /* Change code above this line */ }
    </div>
  );
};

class TypesOfFood extends React.Component {
  constructor(props) {
    super(props);
  }

  render() {
    return (
      <div>
        <h1>Types of Food:</h1>
        { /* Change code below this line */ }
        <Fruits />
        { /* Change code above this line */ }
      </div>
    );
  }
};