Implement getCardValue function to handle card ranks, including Aces, face cards, and invalid inputs

Author: MohammedNaru

Sprint-3/1-implement-and-rewrite-tests/implement/3-get-card-value.js

@@ -8,9 +8,26 @@
 // write one test at a time, and make it pass, build your solution up methodically
 // just make one change at a time -- don't rush -- programmers are deep and careful thinkers
 function getCardValue(card) {
+  // Extract the rank (everything except the last character, which is the suit emoji)
+  const rank = card.slice(0, -1);
+
+  // Handle Ace
   if (rank === "A") {
     return 11;
   }
+
+  // Handle Face Cards (J, Q, K)
+  if (rank === "J" || rank === "Q" || rank === "K" || rank === "10") {
+    return 10;
+  }
+
+  // Handle Number Cards (2-9)
+  if (!isNaN(rank)) {
+    return Number(rank);
+  }
+
+  // Handle Invalid Cards
+  throw new Error("Invalid card rank.");
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -26,6 +43,7 @@ function assertEquals(actualOutput, targetOutput) {
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
+
 // Acceptance criteria:
 
 // Given a card string in the format "A♠" (representing a card in blackjack - the last character will always be an emoji for a suit, and all characters before will be a number 2-10, or one letter of J, Q, K, A),
@@ -39,19 +57,32 @@ assertEquals(aceofSpades, 11);
 // When the function is called with such a card,
 // Then it should return the numeric value corresponding to the rank (e.g., "5" should return 5).
 const fiveofHearts = getCardValue("5♥");
-// ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(fiveofHearts, 5);
+
+const tenofClubs = getCardValue("10♣");
+assertEquals(tenofClubs, 10);
 
 // Handle Face Cards (J, Q, K):
-// Given a card with a rank of "10," "J," "Q," or "K",
+// Given a card with a rank of "J," "Q," or "K",
 // When the function is called with such a card,
 // Then it should return the value 10, as these cards are worth 10 points each in blackjack.
+const jackOfDiamonds = getCardValue("J♦");
+assertEquals(jackOfDiamonds, 10);
+
+const queenOfSpades = getCardValue("Q♠");
+assertEquals(queenOfSpades, 10);
 
-// Handle Ace (A):
-// Given a card with a rank of "A",
-// When the function is called with an Ace,
-// Then it should, by default, assume the Ace is worth 11 points, which is a common rule in blackjack.
+const kingOfHearts = getCardValue("K♥");
+assertEquals(kingOfHearts, 10);
 
 // Handle Invalid Cards:
 // Given a card with an invalid rank (neither a number nor a recognized face card),
 // When the function is called with such a card,
 // Then it should throw an error indicating "Invalid card rank."
+try {
+  getCardValue("Z♠");
+} catch (e) {
+  assertEquals(e.message, "Invalid card rank.");
+}
+
+console.log("All tests ran! If no errors, all passed.");