SOURCE

function Item(props){
  return (<li>{props.name}</li>)
}
          
function ULComponent(){
  let array = [1,2,3,4,5]
  
  return (<ul>{
    array.map(value => <Item key={value} name={value*5}/>)
  }</ul>)
}
          
ReactDOM.render(<ULComponent/>,document.getElementById('app'))

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