validate string value before converting its value

Author: enjoy15

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

@@ -15,10 +15,11 @@ function getCardValue(card) {
     return 11;
   }
 
-const numeric = Number(rank);            
-if (Number.isInteger(numeric) && numeric >= 2 && numeric <= 10) {
-  return numeric;
-}
+  // Strictly validate rank for number cards (2-10)
+  const validRanks = ["2", "3", "4", "5", "6", "7", "8", "9", "10"];
+  if (validRanks.includes(rank)) {
+    return Number(rank);
+  }
 
   if (rank === "J" || rank === "Q" || rank === "K") {
     return 10;

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

@@ -47,9 +47,9 @@ test("should return correct value for all number cards 2-10", () => {
 });
 
 test("should handle numeric-literal edge cases", () => {
-  expect(getCardValue("0x02♠")).toEqual(2); 
+  expect(getCardValue("0x02♠")).toBeUndefined(); 
   expect(getCardValue("2.1♠")).toBeUndefined();      
-  expect(getCardValue("0002♠")).toEqual(2);     
+  expect(getCardValue("0002♠")).toBeUndefined();     
 });
 
 test("should return 10 for all face cards", () => {