Implement getCardValue with tests for all card ranks

Author: khalidbih

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

@@ -22,8 +22,16 @@
 // execute the code to ensure all tests pass.
 
 function getCardValue(card) {
-  // TODO: Implement this function
+  const rank = card.slice(0, -1);
+
+  if (rank === "A") return 11;
+  if (["K", "Q", "J", "10"].includes(rank)) return 10;
+  if (["2", "3", "4", "5", "6", "7", "8", "9"].includes(rank))
+    return Number(rank);
+
+  throw new Error("invalid card rank.");
 }
+// TODO: Implement this function
 
 // 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.
@@ -40,6 +48,11 @@ 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("10♣"), 10);
 
 // Handling invalid cards
 try {
@@ -50,3 +63,5 @@ try {
 } catch (e) {}
 
 // What other invalid card cases can you think of?
+assertEquals(getCardValue("2♦"), 2);
+assertEquals(getCardValue("5♥"), 5);