Dart OOP Example

main.dart

void main() {
  var deck = new Deck();

  print(deck);

  // Shuffle the deck
  deck.shuffle();

  print(deck.cardsWithSuit('Banana'));

  print(deck.deal(5));

  // this deck should have the ones from the deal above omitted - see the deal() function
  print(deck);

  deck.removeCard('Spade', 'Two');

  print(deck);
}

class Deck {
  // Properties
  List<Card> cards = [];

  // Constructor
  Deck() {
    var ranks = ['Ace', 'Two', 'Three', 'Four'];
    var suits = ['Banana', 'Spade', 'Hand', 'Foot'];

    for (var suit in suits) {
      for (var rank in ranks) {
        var card = new Card(suit: suit, rank: rank);
        cards.add(card);
      }
    }
  }

  // return string method
  toString() {
    return cards.toString();
  }

  // Shuffle method (comes from the Dart stdlib)
  shuffle() {
    cards.shuffle();
  }

  // Get all cards in a suit. Make it require one arg, of type String.
  cardsWithSuit(String suit) {
    // Nuts to 'for' loops - we can use List's 'where' method, from the stdlib
    // using fat arrow version here
    return cards.where((card) => card.suit == suit);
  }

  // Deal, punk
  deal(int handSize) {
    // run the stdlib sublist method on our cards list the first time
    var hand = cards.sublist(0, handSize);
    /* 
     ok so now we have sliced the first 'handSize' amount of cards from the List
     But, remember, this has *not* removed them from the original cards List though, as 		 
     we might expect. This is because each item is really a >Reference< to a card,
     not the card itself. So the following takes the remaining cards, and overwrites the 			
     original List with this new set.
    */
    cards = cards.sublist(handSize);
    /* unlike in JS or similar, we don't need to use a second param with .length etc to specify the end 	     
    of the range in sublist; if we just provide it one param, Dart presumes we mean 'to 		
    the end of the List' */

    return hand;
  }

  // Remove a Card
  removeCard(String suit, String rank) {
    cards.removeWhere((card) => (card.suit == suit) && (card.rank == rank));
  }
}

class Card {
  // Properties
  String suit;
  String rank;

  // Constructor
  Card({this.suit, this.rank});

  // return string method
  toString() {
    return '$rank of $suit';
  }
}