Change number type to string to make it work edge cases.

Author: russom

Sprint-2/2-mandatory-errors/3.js

@@ -1,5 +1,5 @@
-const cardNumber = 4533787178994213;
-const last4Digits = Number(String(cardNumber).slice(-4));
+const cardNumber = "4533787178994213";
+const last4Digits = cardNumber.slice(-4);
 
 console.log(last4Digits);