Implement getCardValue and add console.assert tests

Author: lauracs24

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

@@ -22,9 +22,27 @@
 // execute the code to ensure all tests pass.
 
 function getCardValue(card) {
-  // TODO: Implement this function
+  const validSuits = ["♠", "♥", "♦", "♣"];
+  const validRanks = ["A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"];
+
+  if (typeof card !== "string" || card.length < 2) {
+    throw new Error("Invalid card");
+  }
+
+  const suit = card.slice(-1);
+  const rank = card.slice(0, -1);
+
+  if (!validSuits.includes(suit) || !validRanks.includes(rank)) {
+    throw new Error("Invalid card");
+  }
+
+  if (rank === "A") return 11;
+  if (rank === "J" || rank === "Q" || rank === "K") return 10;
+
+  return Number(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;
@@ -50,3 +68,24 @@ try {
 } catch (e) {}
 
 // What other invalid card cases can you think of?
+// Number cards
+assertEquals(getCardValue("2♠"), 2);
+assertEquals(getCardValue("10♥"), 10);
+
+// Face cards
+assertEquals(getCardValue("J♣"), 10);
+assertEquals(getCardValue("Q♦"), 10);
+assertEquals(getCardValue("K♠"), 10);
+
+// Ace
+assertEquals(getCardValue("A♥"), 11);
+
+// More invalid cases
+const invalidCards = ["", "A", "11♠", "1♠", "B♠", "10X", "♠A"];
+
+for (const bad of invalidCards) {
+  try {
+    getCardValue(bad);
+    console.error("Error was not thrown for invalid card:", bad);
+  } catch (e) {}
+}