Enhance getCardValue function comments and add error handling for invalid card ranks

Author: CatchingKiyoko

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

@@ -10,6 +10,7 @@
 function getCardValue(card) {
     var rank = card.slice(0, -1); // get the rank of the card by removing the last character. (the suit is the last character)
     if (rank === "A") return 11; // this checks for Aces
+    // Handle Number Cards (2-9)
     if (rank === "2") return 2; // this checks for the twos
     if (rank === "3") return 3; // this checks for the threes
     if (rank === "4") return 4; // this checks for the fours
@@ -18,10 +19,13 @@ function getCardValue(card) {
     if (rank === "7") return 7; // this checks for the sevens
     if (rank === "8") return 8; // this checks for the eights
     if (rank === "9") return 9; // this checks for the nines
+    // Handle Face Cards (J, Q, K) And 10's
     if (rank === "J") return 10; // this checks for Jacks
     if (rank === "Q") return 10; // this checks for Queens
     if (rank === "K") return 10; // this checks for Kings
     if (rank === "10") return 10; // this checks for Tens
+    // if none of the above its an invalid card and throw an error
+    throw new Error("Invalid card rank."); // this will throw an error if the card is not a valid rank
 }
 // You need to write assertions for your function to check it works in different cases
 // we're going to use this helper function to make our assertions easier to read
@@ -44,6 +48,7 @@ assertEquals(aceofSpades, 11);
 // 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).
+// ====> write your test here, and then add a line to pass the test in the function above
 const fiveofHearts = getCardValue("5♥");
 const sixofDiamonds = getCardValue("6♦");
 const sevenofClubs = getCardValue("7♣");
@@ -52,7 +57,6 @@ assertEquals(fiveofHearts, 5);
 assertEquals(sixofDiamonds, 6);
 assertEquals(sevenofClubs, 7);
 assertEquals(eightofSpades, 8);
-// ====> 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",
@@ -72,4 +76,9 @@ assertEquals(kingOfSpades, 10);
 // 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("z♠"); // this should throw an error of "Invalid card rank."
+  console.log("Test failed: Expected an error for invalid card rank.");
+} catch(error){
+  assertEquals(error.meessage, "Invalid card rank.");
+}