answer get-card-value questions

Author: Pinx-pinx

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

@@ -8,9 +8,17 @@
 // write one test at a time, and make it pass, build your solution up methodically
 // just make one change at a time -- don't rush -- programmers are deep and careful thinkers
 function getCardValue(card) {
+  let rank = card.slice(0, -1);
   if (rank === "A") {
     return 11;
   }
+  if (rank >= "2" && rank <= "9") {
+    return Number(rank);
+  }
+  if (rank === "J" || rank === "Q" || rank === "K") {
+    return 10;
+  }
+  throw new Error("Invalid card rank");
 }
 
 // The line below allows us to load the getCardValue function into tests in other files.
@@ -39,19 +47,42 @@ assertEquals(aceofSpades, 11);
 // 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).
 const fiveofHearts = getCardValue("5♥");
-// ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(fiveofHearts, 5);
 
 // Handle Face Cards (J, Q, K):
 // Given a card with a rank of "10," "J," "Q," or "K",
 // When the function is called with such a card,
 // Then it should return the value 10, as these cards are worth 10 points each in blackjack.
+const ten = getCardValue("10");
+assertEquals(ten, 10);
+
+const jack = getCardValue("J♦");
+assertEquals(jack, 10);
+
+const queen = getCardValue("Q♠");
+assertEquals(queen, 10);
+
+const king = getCardValue("K♥");
+assertEquals(king, 10);
 
 // Handle Ace (A):
 // Given a card with a rank of "A",
 // When the function is called with an Ace,
 // Then it should, by default, assume the Ace is worth 11 points, which is a common rule in blackjack.
 
+const ace = getCardValue("A♥");
+assertEquals(ace, 11);
+
 // Handle Invalid Cards:
 // 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♥");
+} catch (e) {
+  console.assert(
+    e.message === "Invalid card rank",
+    `Expected "Invalid card rank" but got "${e.message}"`
+  );
+}