Implement getCardValue function to handle card values and add tests for A, face cards, number cards, and invalid inputs

Author: MohammedNaru

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

@@ -8,9 +8,23 @@
 // 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) {
+  const rank = card.slice(0, -1); // <-- answer
+
   if (rank === "A") {
-    return 11;
+    return 11; // <-- answer
+  }
+
+  if (["K", "Q", "J", "10"].includes(rank)) {
+    return 10; // <-- answer
   }
+
+  const num = Number(rank); // <-- answer
+
+  if (num >= 2 && num <= 9) {
+    return num; // <-- answer
+  }
+
+  throw new Error("Invalid card rank"); // <-- answer
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -26,32 +40,44 @@ 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),
 // 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);
+assertEquals(aceofSpades, 11); // <-- answer
 
 // 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
+assertEquals(fiveofHearts, 5); // <-- answer
 
 // 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.
+assertEquals(getCardValue("10♦"), 10); // <-- answer
+assertEquals(getCardValue("J♣"), 10); // <-- answer
+assertEquals(getCardValue("Q♠"), 10); // <-- answer
+assertEquals(getCardValue("K♥"), 10); // <-- answer
 
 // 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.
+assertEquals(getCardValue("A♦"), 11); // <-- answer
 
 // 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♠");
+  console.assert(false, "Expected an error"); // <-- answer
+} catch (e) {
+  console.assert(e.message === "Invalid card rank"); // <-- answer
+}