https://reactjs.org/tutorial/tutorial.html code example

Example 1: react tutorial

class Board extends React.Component {
  constructor(props) {    super(props);    this.state = {      squares: Array(9).fill(null),    };  }
  renderSquare(i) {
    return <Square value={i} />;
  }

Example 2: react tutorial

renderSquare(i) {
    return <Square value={i} />;
  }

Example 3: React js tutorial

npx create-react-app my-app
cd my-app
cd src

# If you're using a Mac or Linux:
rm -f *

# Or, if you're on Windows:
del *

# Then, switch back to the project folder
cd ..

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Html Example