[Sync Iteration] go/blackjack/1

solutions/go/blackjack/1/blackjack.go

@@ -0,0 +1,75 @@
+package blackjack
+
+// ParseCard returns the integer value of a card following blackjack ruleset.
+func ParseCard(card string) int {
+	switch card {
+	case "ace":
+		return 11
+
+	case "two":
+		return 2
+
+	case "three":
+		return 3
+
+	case "four":
+		return 4
+
+	case "five":
+		return 5
+
+	case "six":
+		return 6
+
+	case "seven":
+		return 7
+
+	case "eight":
+		return 8
+
+	case "nine":
+		return 9
+
+	case "ten", "jack", "queen", "king":
+		return 10
+
+	default:
+		return 0
+	}
+}
+
+// FirstTurn returns the decision for the first turn, given two cards of the
+// player and one card of the dealer.
+func FirstTurn(card1, card2, dealerCard string) string {
+	var cardSum = ParseCard(card1) + ParseCard(card2)
+	var dealerCardValue = ParseCard(dealerCard)
+
+	switch cardSum {
+	case 22:
+		return "P"
+
+	case 21:
+		switch dealerCard {
+		case "ace", "jack", "queen", "king":
+			return "S"
+
+		default:
+			return "W"
+		}
+
+	case 17, 18, 19, 20:
+		return "S"
+
+	case 12, 13, 14, 15, 16:
+		switch {
+		case dealerCardValue >= 7:
+			return "H"
+
+		default:
+			return "S"
+		}
+
+	default:
+		return "H"
+	}
+}