feat: blackjack challenge

blackjack/blackjack.go

@@ -0,0 +1,60 @@
+package blackjack
+
+// ParseCard returns the integer value of a card following blackjack ruleset.
+func ParseCard(card string) int {
+    var value int
+	switch  {
+        case card == "ace":
+         	value = 11
+        case card == "two": 
+        	value = 2
+        case card == "three":
+        	value = 3
+        case card == "four": 
+        	value = 4
+        case card == "five": 
+        	value = 5
+        case card == "six":
+        	value = 6
+        case card == "seven":
+			value = 7
+        case card == "eight":
+			value = 8
+        case card == "nine": 
+			value = 9
+        case card == "ten" || card == "jack" || card == "queen" || card == "king":
+        	value = 10
+        default:
+        	value = 0
+    }
+    return value
+}
+
+// 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 {
+	total := ParseCard(card1) + ParseCard(card2)
+    dealerTotal := ParseCard(dealerCard)
+
+    var result string 
+
+    switch {
+        case card1 == card2 && card1 == "ace": 
+        	result = "P"
+        case total == 21 && (dealerCard != "ace" && dealerTotal != 10): 
+        	result = "W"
+        case total == 21:
+			result = "S"
+        case total == 21 && dealerCard == "ace": 
+        	result = "S"
+        case total >= 17 && total <= 20: 
+			result = "S"
+        case total >= 12 && total <= 16 && dealerTotal < 7:
+        	result = "S"
+        case total >= 12 && total <= 16 && dealerTotal >= 7:
+        	result = "H"
+        case total <= 11: 
+        	result = "H"
+    }
+    return result
+}