Implement getCardValue function with tests

Author: khalidbih

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

@@ -8,8 +8,16 @@
 // 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;
+  } else if (["K", "Q", "J", "10"].includes(rank)) {
+    return 10;
+  } else if (["2", "3", "4", "5", "6", "7", "8", "9"].includes(rank)) {
+    return Number(rank);
+  } else {
+    throw new Error("Invalid card rank.");
   }
 }
 
@@ -31,21 +39,32 @@ 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♥");
+const fiveOfHearts = getCardValue("5♥");
+assertEquals(fiveOfHearts, 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.
+const tenOfDiamonds = getCardValue("10♦");
+assertEquals(tenOfDiamonds, 10);
+
+const jackOfClubs = getCardValue("J♣");
+assertEquals(jackOfClubs, 10);
 
+const queenOfSpades = getCardValue("Q♠");
+assertEquals(queenOfSpades, 10);
+
+const kingOfHearts = getCardValue("K♥");
+assertEquals(kingOfHearts, 10);
 // Handle Ace (A):
 // Given a card with a rank of "A",
 // When the function is called with an Ace,
@@ -55,3 +74,9 @@ const fiveofHearts = getCardValue("5♥");
 // 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.error("Test failed: invalid card did not throw error");
+} catch (error) {
+  console.log("Invalid card test passed");
+}