friendsContainer.js

class Container extends React.Component {

    constructor(props) {
      super(props);
      this.state = {
        friends: []
      };
    }

    componentDidMount() {
      FriendsService.fetchFriends().then((data) => {
        this.setState({
          friends: data
        });
      });
    }

    render() {
      const { friends } = this.state;
      return (
        <View style={styles.flex}>
        <FriendsHeader count={friends.length} text='My friends' />
        {friends.map((friend) => (<FriendRow {...friend} />)) }
        </View>
      );
    }
}