implement getCardValue

Author: Vaidah-dev

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

@@ -1,28 +1,31 @@
-// This problem involves playing cards: https://en.wikipedia.org/wiki/Standard_52-card_deck
-
-// Don't forget to write tests in implement-tests-with-node-test.
-
-// Implement a function getCardValue, when given a string representing a playing card,
-// should return the numerical value of the card.
-
-// A valid card string will contain a rank followed by the suit.
-// The rank can be one of the following strings:
-//   "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"
-// The suit can be one of the following emojis:
-//   "♠", "♥", "♦", "♣"
-// For example: "A♠", "2♥", "10♥", "J♣", "Q♦", "K♦".
-
-// When the card is an ace ("A"), the function should return 11.
-// When the card is a face card ("J", "Q", "K"), the function should return 10.
-// When the card is a number card ("2" to "10"), the function should return its numeric value.
-
-// When the card string is invalid (not following the above format), the function should
-// throw an error.
+export function getCardValue(card) {
+  const suit = card.slice(-1);
+  const rank = card.slice(0, -1);
+  const validSuits = "♠♥♦♣";
+  const validRanks = [
+    "A",
+    "2",
+    "3",
+    "4",
+    "5",
+    "6",
+    "7",
+    "8",
+    "9",
+    "10",
+    "J",
+    "Q",
+    "K",
+  ];
 
-// Acceptance criteria:
-// After you have implemented the function, write tests to cover all the cases, and
-// execute the code to ensure all tests pass.
+  if (!validSuits.includes(suit)) {
+    throw new Error(`Expected a number followed by a suit, but got "${card}"`);
+  }
+  if (!validRanks.includes(rank)) {
+    throw new Error(`Expected a number followed by a suit, but got "${card}"`);
+  }
 
-export function getCardValue(card) {
-  // TODO: Implement this function
+  if (rank === "A") return 11;
+  if (rank === "J" || rank === "Q" || rank === "K") return 10;
+  return Number(rank);
 }