added an extra function to turn the card number into a string

Changed cardNumber to a string before slicing to get last 4 digits.

Author: khaliun-dev

Sprint-1/2-mandatory-errors/3.js

@@ -1,5 +1,13 @@
+//const cardNumber = 4533787178994213;
+//const last4Digits = cardNumber.slice(-4);
+
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = String(cardNumber).slice(-4);
+
+//My prediction was the long card number isn't a string so js will assume it's a variable
+//Error given: cardNumber.slice is not a function
+//added String function
+
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working