Implement getCardValue function to handle card values and add tests for valid and invalid cards

Author: zilinskyte

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

@@ -1,16 +1,17 @@
-// This problem involves playing cards: https://en.wikipedia.org/wiki/Standard_52-card_deck
-
-// You will need to implement a function getCardValue
-// the function takes a single parameter, a string representing a playing card
-// the function should return the numerical value of the card
-// the first test and first case is written for you
-// complete the rest of the tests and cases
-// 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);
   if (rank === "A") {
     return 11;
   }
+  if (!isNaN(rank) && Number(rank) >= 2 && Number(rank) <= 10) {
+    // checks for number cards 2-10
+    return Number(rank);
+  }
+  if (["J", "Q", "K"].includes(rank)) {
+    return 10;
+  } else {
+    throw new Error("Invalid card rank");
+  }
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -26,32 +27,49 @@ function assertEquals(actualOutput, targetOutput) {
     `Expected ${actualOutput} to equal ${targetOutput}`
   );
 }
-// Acceptance criteria:
 
+// Case 1
 // 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);
 
+// Case 2
 // 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);
 
+// Case 3
 // 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 kingofDiamonds = getCardValue("K♦");
+assertEquals(kingofDiamonds, 10);
 
+// Case 4
 // 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);
 
+// Case 5
 // 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("1♣");
+  console.assert(false, "Expected error for invalid card");
+} catch (error) {
+  console.assert(
+    error.message === "Invalid card rank",
+    `Expected "Invalid card rank" error, but got: ${error.message}`
+  );
+}