Refactor RPS/RPSLS

lib/rand.go

@@ -49,3 +49,9 @@ func MapRand[K comparable, V any](m map[K]V) V {
 	}
 	panic("unreachable")
 }
+
+func MapRandKey[K comparable, V any](m map[K]V) K {
+	keys := MapKeys(m)
+	n := rand.Intn(len(m))
+	return keys[n]
+}

lib/rps/rps.go

@@ -0,0 +1,62 @@
+package rps
+
+import (
+	"fmt"
+)
+
+type (
+	Game struct {
+		rules    [][]string
+		emojiMap map[string]string
+	}
+)
+
+var (
+	RulesRps [][]string = [][]string{
+		{"rock", "scissors", "crushes"},
+		{"paper", "rock", "covers"},
+		{"scissors", "paper", "cuts"},
+	}
+
+	EmojiMapRps map[string]string = map[string]string{
+		"rock":     "🪨️",
+		"paper":    "📝",
+		"scissors": "✂️",
+	}
+
+	RulesRpsls [][]string = [][]string{
+		{"rock", "scissors", "crushes"},
+		{"rock", "lizard", "crushes"},
+		{"paper", "rock", "covers"},
+		{"paper", "spock", "disproves"},
+		{"scissors", "paper", "cuts"},
+		{"scissors", "lizard", "decapitates"},
+		{"lizard", "paper", "eats"},
+		{"lizard", "spock", "poisons"},
+		{"spock", "scissors", "smashes"},
+		{"spock", "rock", "vaporizes"},
+	}
+
+	EmojiMapRpsls map[string]string = map[string]string{
+		"rock":     "🪨️",
+		"paper":    "📝",
+		"scissors": "✂️",
+		"lizard":   "🦎",
+		"spock":    "🖖",
+	}
+)
+
+func Play(rules [][]string, c1, c2 string) string {
+	for _, rule := range rules {
+		if c1 == c2 {
+			return "draw"
+		}
+
+		if c1 == rule[0] && c2 == rule[1] {
+			return fmt.Sprintf("%s %s %s", c1, rule[2], c2)
+		} else if c2 == rule[0] && c1 == rule[1] {
+			return fmt.Sprintf("%s %s %s", c2, rule[2], c1)
+		}
+	}
+	return ""
+}