Compiled with warnings. [eslint] src/App.js Line 12:35: Array.prototype.map() expects a return value from arrow function array-callback-return Search for the keywords to learn more about each warning. To ignore, add // eslint-disable-next-line to the line before. WARNING in [eslint] src/App.js Line 12:35: Array.prototype.map() expects a return value from arrow function array-callback-return function App() { const list= [ {id:1, name: 'item1'}, {id:2, name: 'item2'}, {id:3, name: 'item3'}, {id:4, name: 'item4'}, ] const listContent = list.map(item =>{ <li key={item.id}>{item.name}</li> }) return( <ul>{listContent}</ul> ) } export default App;