feat: implement getCardValue function with comprehensive test cases

Author: Tarawally

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

@@ -8,9 +8,12 @@
 // 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) {
-  if (rank === "A") {
-    return 11;
-  }
+  const rank = card.slice(0, -1);
+  if (rank === "A") return 11;
+  if (rank === "J" || rank === "Q" || rank === "K" || rank === "10") return 10;
+  const numValue = parseInt(rank);
+  if (numValue >= 2 && numValue <= 9) return numValue;
+  throw new Error("Invalid card rank");
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -31,27 +34,54 @@ function assertEquals(actualOutput, targetOutput) {
 // 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),
 // When the function getCardValue is called with this card string as input,
 // Then it should return the numerical card value
-const aceofSpades = getCardValue("A♠");
-assertEquals(aceofSpades, 11);
+
+const aceOfSpades = getCardValue("A♠");
+assertEquals(aceOfSpades, 11);
 
 // Handle Number Cards (2-10):
 // Given a card with a rank between "2" and "9",
 // 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
+
+const fiveOfHearts = getCardValue("5♥");
+assertEquals(fiveOfHearts, 5);
+const twoOfDiamonds = getCardValue("2♦");
+assertEquals(twoOfDiamonds, 2);
+const nineOfSpades = getCardValue("9♠");
+assertEquals(nineOfSpades, 9);
 
 // Handle Face Cards (J, Q, K):
 // Given a card with a rank of "10," "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 kingOfHearts = getCardValue("K♥");
+assertEquals(kingOfHearts, 10);
+const queenOfSpades = getCardValue("Q♠");
+assertEquals(queenOfSpades, 10);
+const jackOfDiamonds = getCardValue("J♦");
+assertEquals(jackOfDiamonds, 10);
+const tenOfClubs = getCardValue("10♣");
+assertEquals(tenOfClubs, 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 aceOfHearts = getCardValue("A♥");
+assertEquals(aceOfHearts, 11);
+
 // 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("X♠");
+  console.assert(false, "Should have thrown an error for invalid card");
+} catch (error) {
+  assertEquals(error.message, "Invalid card rank");
+}
+
+console.log("✅ All tests passed!");