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Task/Playing-cards/Nim/playing-cards.nim

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+import math
+randomize()
+
+proc shuffle[T](x: var seq[T]) =
+ for i in countdown(x.high, 0):
+   let j = random(i + 1)
+   swap(x[i], x[j])
+
+type
+  Suit = enum ♥, ♦, ♣, ♠
+
+  Pip = enum c02, c03, c04, c05, c06, c07, c08, c09, c10, cQu, cKi, cAs
+
+  Card = object
+    pip: Pip
+    suit: Suit
+
+  Deck = object
+    cards: seq[Card]
+
+proc `$`(c: Card): string = $c.pip & $c.suit
+
+proc initDeck(): Deck =
+  result = Deck(cards: @[])
+  for suit in Suit:
+    for pip in Pip:
+      result.cards.add Card(pip: pip, suit: suit)
+
+proc `$`(d: Deck): string = $d.cards
+
+proc shuffle(d: var Deck) = shuffle(d.cards)
+
+proc deal(d: var Deck): Card =
+  d.shuffle()
+  d.cards.pop()
+
+var d = initDeck()
+echo "40 cards from a deck:"
+for i in 0..4:
+  for j in 0..7:
+    stdout.write($d.deal(), " ")
+  echo ""
+echo "The remaining cards are: ", $d