Implement getCardValue and add assertion tests for valid and invalid cards

Author: Richiealx

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

@@ -22,7 +22,35 @@
 // execute the code to ensure all tests pass.
 
 function getCardValue(card) {
-  // TODO: Implement this function
+  const suits = ["♠", "♥", "♦", "♣"];
+
+  // Card must be a string
+  if (typeof card !== "string") {
+    throw new Error("Invalid card");
+  }
+
+  const suit = card.slice(-1);
+  const rank = card.slice(0, -1);
+
+  if (!suits.includes(suit)) {
+    throw new Error("Invalid card");
+  }
+
+  if (rank === "A") {
+    return 11;
+  }
+
+  if (["J", "Q", "K"].includes(rank)) {
+    return 10;
+  }
+
+  const number = Number(rank);
+
+  if (number >= 2 && number <= 10) {
+    return number;
+  }
+
+  throw new Error("Invalid card");
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -38,15 +66,42 @@ function assertEquals(actualOutput, targetOutput) {
 }
 
 // TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
-// Examples:
+
+// Number cards
+assertEquals(getCardValue("2♠"), 2);
 assertEquals(getCardValue("9♠"), 9);
+assertEquals(getCardValue("10♥"), 10);
+
+// Face cards
+assertEquals(getCardValue("J♣"), 10);
+assertEquals(getCardValue("Q♦"), 10);
+assertEquals(getCardValue("K♦"), 10);
+
+// Ace
+assertEquals(getCardValue("A♠"), 11);
 
 // Handling invalid cards
 try {
   getCardValue("invalid");
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}
+
+try {
+  getCardValue("1♠");
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}
+
+try {
+  getCardValue("11♠");
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}
 
-  // This line will not be reached if an error is thrown as expected
+try {
+  getCardValue("A");
   console.error("Error was not thrown for invalid card");
 } catch (e) {}
 
-// What other invalid card cases can you think of?
+try {
+  getCardValue("♠");
+  console.error("Error was not thrown for invalid card");
+} catch (e) {}