reactintro/14.state.array.html at master · linyutg/reactintro · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>state</title>
    <meta charset="utf-8" />
    <style>
      body {
        font-family: -apple-system, sans-serif;
      }
    </style>
  </head>
  <body>
    <div id="app"></div>
    <script src="react/react.js"></script>
    <script src="react/react-dom.js"></script>
    <script src="react/babel.js"></script>
    <script type="text/babel"></script>
  </body>
  <script type="text/babel">
    const { useState } = React;

    let nextId = 0;

    function List() {
      const [name, setName] = useState("");
      const [artists, setArtists] = useState([]);

      return (
        <div>
          <h1>Inspiring sculptors:</h1>
          <input value={name} onChange={(e) => setName(e.target.value)} />
          <button
            onClick={() => {
              setName("");
              setArtists([...artists, { id: nextId++, name: name }]);
              // artists.push({
              //   id: nextId++,
              //   name: name,
              // });
            }}
          >
            Add
          </button>
          <ul>
            {artists.map((artist) => (
              <li key={artist.id}>{artist.name}</li>
            ))}
          </ul>
        </div>
      );
    }

    ReactDOM.render(<List />, document.getElementById("app"));
  </script>
</html>