how to use for in react code example

Example 1: react for

render() {
  const elements = ['one', 'two', 'three'];

  const items = []

  for (const [index, value] of elements.entries()) {
    items.push(<li key={index}>{value}</li>)
  }

  return (
    <div>
      {items}
    </div>
  )
}

Example 2: react quick tutorial

ReactDOM.render(  
    <Hello />,   
    document.getElementById("root")  
);