How to loop over a number in React inside JSX

Question

You could use Array.from() instead.

let App = () => {
  return <ul>{Array.from(Array(10), (e, i) => {
    return <li key={i}>{i}</li>
  })}</ul>
}

ReactDOM.render(
  <App />,
  document.getElementById('app')
);

<script src="https://unpkg.com/react@16.1.0/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16.1.0/umd/react-dom.development.js"></script>
<div id="app"></div>

You can also use ES6 spread syntax with map() method.

let App = () => {
  return <ul>{[...Array(10)].map((e, i) => {
    return <li key={i}>{i}</li>
  })}</ul>
}

ReactDOM.render(
  <App />,
  document.getElementById('app')
);

<script src="https://unpkg.com/react@16.1.0/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16.1.0/umd/react-dom.development.js"></script>
<div id="app"></div>

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