feat(card_game): add Suit::is_black and Rank::value convenience methods

card_game/src/lib.rs

@@ -72,6 +72,10 @@ impl Suit {
 	pub const fn is_red(self) -> bool {
 		self as u8 & 0b01 != 0
 	}
+	/// Is the suit black.
+	pub const fn is_black(self) -> bool {
+		!self.is_red()
+	}
 	/// Suit value is 2 bits, is_red is the low bit.
 	pub const fn suit_high_bit(self) -> bool {
 		self as u8 & 0b10 != 0
@@ -130,6 +134,10 @@ impl Rank {
 			_ => return None,
 		})
 	}
+	/// Numeric value: Ace = 1, King = 13.
+	pub const fn value(self) -> u8 {
+		self as u8
+	}
 	pub const fn checked_add(self, offset: u8) -> Option<Rank> {
 		match (self as u8).checked_add(offset) {
 			Some(rank) => Self::new(rank),