Add card value function + tests

Author: ChinweP

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

@@ -23,6 +23,40 @@
 
 function getCardValue(card) {
   // TODO: Implement this function
+  const validRanks = [
+    "A",
+    "2",
+    "3",
+    "4",
+    "5",
+    "6",
+    "7",
+    "8",
+    "9",
+    "10",
+    "J",
+    "Q",
+    "K",
+  ];
+  const validSuits = ["♠", "♥", "♦", "♣"];
+
+  // Suit is always the last character
+  const suit = card.slice(-1);
+
+  // Rank is everything before the suit
+  const rank = card.slice(0, -1);
+
+  // Validate rank and suit
+  if (!validRanks.includes(rank) || !validSuits.includes(suit)) {
+    throw new Error("Invalid card");
+  }
+
+  // Convert rank to value
+  if (rank === "A") return 11;
+  if (["J", "Q", "K"].includes(rank)) return 10;
+
+  // Number card
+  return Number(rank);
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -40,6 +74,12 @@ function assertEquals(actualOutput, targetOutput) {
 // TODO: Write tests to cover all outcomes, including throwing errors for invalid cards.
 // Examples:
 assertEquals(getCardValue("9♠"), 9);
+assertEquals(getCardValue("A♣"), 11);
+assertEquals(getCardValue("J♦"), 10);
+assertEquals(getCardValue("Q♥"), 10);
+assertEquals(getCardValue("K♠"), 10);
+assertEquals(getCardValue("2♠"), 2);
+assertEquals(getCardValue("10♦"), 10);
 
 // Handling invalid cards
 try {
@@ -52,3 +92,30 @@ try {
 }
 
 // What other invalid card cases can you think of?
+try {
+  getCardValue("1♠"); // invalid rank
+  console.error("Error was not thrown for invalid rank");
+} catch (e) {
+  console.log("Error thrown for invalid rank 🎉");
+}
+
+try {
+  getCardValue("A?"); // invalid suit
+  console.error("Error was not thrown for invalid suit");
+} catch (e) {
+  console.log("Error thrown for invalid suit 🎉");
+}
+
+try {
+  getCardValue("10"); // missing suit
+  console.error("Error was not thrown for missing suit");
+} catch (e) {
+  console.log("Error thrown for missing suit 🎉");
+}
+
+try {
+  getCardValue(""); // empty string
+  console.error("Error was not thrown for empty string");
+} catch (e) {
+  console.log("Error thrown for empty string 🎉");
+}