Completed 3-get-card-value.js exercise

Author: Eugenie-A

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

@@ -23,6 +23,31 @@
 
 function getCardValue(card) {
   // TODO: Implement this function
+  // Checks that input is a string and has correct length,
+  // 2 chars for 2-9/A/J/Q/K, 3 chars for 10
+  if (typeof card !== 'string' || (card.length !== 2 && card.length !==3)) {
+    throw new Error('Invalid card format');
+  }
+  // Get the suit, always the last character
+  const suit = card.slice(-1);
+  // Get the rank, everything except the last character
+  const rank = card.slice(0, -1);
+  // Checks if suit is one of the four allowed symbols
+  if (!'♠♥♦♣'.includes(suit)) {
+    throw new Error('Invalid suit');
+  }
+  // Special case: Ace is worth 11
+  if (rank === 'A') return 11;
+  // Special case: Face cards (Jack, Queen, King) are worth 10
+  if (rank === 'J' || rank === 'Q' || rank === 'K') return 10;
+  // For number cards (2-10): converts rank string into number
+  const value = Number(rank);
+  // Makes sure it's actually a valid number between 2 and 10
+  if (isNaN(value) || value < 2 || value > 10) {
+    throw new Error('Invalid rank');
+  }
+  // Return the numeric value for 2-10
+  return value;
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -41,7 +66,29 @@ function assertEquals(actualOutput, targetOutput) {
 // Examples:
 assertEquals(getCardValue("9♠"), 9);
 
+// Valid number cards (2-10)
+const twoofHearts = getCardValue("2♥");
+assertEquals(twoofHearts, 2);
+
+const fiveofDiamonds = getCardValue("5♦");
+assertEquals(fiveofDiamonds, 5);
+
+// Ace returns 11
+const aceofSpades = getCardValue("A♠");
+assertEquals(aceofSpades, 11);
+
+// Face cards return 10 (J, Q, K)
+const jackofHearts = getCardValue("J♥");
+assertEquals(jackofHearts, 10);
+
+const queenofDiamonds = getCardValue("Q♦");
+assertEquals(queenofDiamonds, 10);
+
+const kingofClubs = getCardValue("K♣");
+assertEquals(kingofClubs, 10);
+
 // Handling invalid cards
+// Invalid format, random string
 try {
   getCardValue("invalid");
 
@@ -50,3 +97,32 @@ try {
 } catch (e) {}
 
 // What other invalid card cases can you think of?
+// Too short, missing suit
+try {
+  getCardValue("A");
+  console.error("Error was not thrown for too short card");
+} catch (e) {}
+
+// Invalid rank
+try {
+  getCardValue("X♠");
+  console.error("Error was not thrown for invalid rank");
+} catch (e) {}
+
+// Invalid suit, wrong symbol
+try {
+  getCardValue("Kx");
+  console.error("Error was not thrown for missing suit");
+} catch (e) {}
+
+// Missing suit
+try {
+  getCardValue("10");
+  console.error("Error was not thrown for missing suit");
+} catch (e) {}
+
+// Empty string
+try {
+  getCardValue("");
+  console.error("Error was not thrown for empty string");
+} catch (e) {}