The Beginner's Guide To React: Fragment

#webdev #react #beginners

What is a Fragment?
The React.Fragment component allows you to return multiple elements in a render() method without creating an additional DOM element.

If you are thinking about where React.Fragment component is useful then let’s take a scenario where you what to print two span side by side without wrapping it by an additional element such as div tag then this case you can use React.Fragment component.

We are not using JSX in the code given below.

<body>
    <div id="root">This will be replace by React</div>

    <script src="https://unpkg.com/react@16.13.1/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16.13.1/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.9.4/babel.js"></script>
    <script type="text/babel">
      const rootElement = document.getElementById("root");

      const helloElement = React.createElement("span", null, "Hello, ");
      const worldElement = React.createElement("span", null, "World");
      const fragment = React.createElement(
        React.Fragment,
        null,
        helloElement,
        worldElement
      );

      ReactDOM.render(fragment, rootElement);
    </script>
</body>

Output:

JSX Code:

<body>
    <div id="root">This will be replace by React</div>

    <script src="https://unpkg.com/react@16.13.1/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16.13.1/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.9.4/babel.js"></script>
    <script type="text/babel">
      const rootElement = document.getElementById("root");

    // JSX Code
      const helloElement = <span>Hello, </span>;
      const worldElement = <span>World</span>;
      const fragment = (
        <React.Fragment>
          {helloElement}
          {worldElement}
        </React.Fragment>
      );

      ReactDOM.render(fragment, rootElement);
    </script>
</body>

Output:

You can also use <></> syntax instead of React.Fragment which is I personly use.

JSX Code:

<body>
    <div id="root">This will be replace by React</div>

    <script src="https://unpkg.com/react@16.13.1/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16.13.1/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.9.4/babel.js"></script>
    <script type="text/babel">
      const rootElement = document.getElementById("root");

    // JSX Code
      const helloElement = <span>Hello, </span>;
      const worldElement = <span>World</span>;
      const fragment = (
        <>
          {helloElement}
          {worldElement}
        </>
      );

      ReactDOM.render(fragment, rootElement);
    </script>
</body>