feat(sprint-3): implement getCardValue function

Author: Tarawally

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

@@ -8,50 +8,46 @@
 // 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.
-// This will be useful in the "rewrite tests with jest" step.
 module.exports = getCardValue;
 
-// You need to write assertions for your function to check it works in different cases
-// we're going to use this helper function to make our assertions easier to read
-// if the actual output matches the target output, the test will pass
 function assertEquals(actualOutput, targetOutput) {
   console.assert(
     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);
-
-// 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
-
-// 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.
-
-// 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.
-
-// 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."
+
+// Ace → 11
+assertEquals(getCardValue("A♠"), 11);
+
+// Number Cards → numeric value
+assertEquals(getCardValue("5♥"), 5);
+assertEquals(getCardValue("2♦"), 2);
+assertEquals(getCardValue("9♣"), 9);
+
+// Face Cards (J, Q, K, 10) → 10
+assertEquals(getCardValue("K♥"), 10);
+assertEquals(getCardValue("Q♠"), 10);
+assertEquals(getCardValue("J♦"), 10);
+assertEquals(getCardValue("10♣"), 10);
+
+// Ace (all suits) → 11
+assertEquals(getCardValue("A♥"), 11);
+
+// Invalid Card → throw error
+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!");