Use .map() to iterate array inside a object React

Question

I'm trying to iterate throw elements in a Array of objects, but since the returned data is not an Array but a Object, .map() can't be used in the simple way.

API returns the following structure

/players (endpoint)

{
  "players": [
    {
      "player_id": "Uy2sZ5ef",
      "player_name": "Foo",
      "player_team": "5c50bae023213348c4453aaf"      
    },
    {      
      "player_id": "h15sqI4D",
      "player_name": "Foo 2",
      "player_team": "5c50bae023213348c4453aaf"
    }
  ]
}

React component

export class Players extends Component {
    state = {
        players: []
    }

    componentDidMount() {
    API.get(`players/`).then(res => {
            console.log(res)
            this.setState({ players: res.data })
        })
    }

    render() {
        return (
            <section className="contents">

                { this.state.players.map(player => <li>{player.player_name}</li>)}

            </section>
        );
    }
}

CevaComic · Accepted Answer · 2020-06-15 23:01:40Z

7

If your data looks like that object, and you need only players, you should:

    componentDidMount() {
    API.get(`players/`).then(res => {
            console.log(res)
            this.setState({ players: res.data.players }) // <-- get only the players
        })
    }

answered Jun 15, 2020 at 23:01

CevaComic

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1 Comment

Qu4k3 Over a year ago

That's correct, I was unable to find it. After Stackoverflow's delay to accept this answer, I'll do it :)

Ruhul Amin · Accepted Answer · 2020-06-15 23:12:55Z

1

You might be interested in functional component:

const Players = () => {
  const [players, setPlayers] = useState([]);

  useEffect(() => {
    API.get(`players/`).then(res => {
      console.log(res);
      setPlayers(res.data.players); // <-- get only the players
    });
  }, []);

  return (
    <section className="contents">
      {players.map(player => (
        <li>{player.player_name}</li>
      ))}
    </section>
  );
};

answered Jun 15, 2020 at 23:12

Ruhul Amin

1,78515 silver badges20 bronze badges

1 Comment

CevaComic Over a year ago

Indeed we all should work with functional components !

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