modified the answer of 2-mandatory-errors 3.js

Author: leerogerfn

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

@@ -1,5 +1,5 @@
-const cardNumber = '4533787178994213';
-const last4Digits = cardNumber.slice(-4);
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
 
 console.log(last4Digits)
 
@@ -10,4 +10,5 @@ console.log(last4Digits)
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
 
-//slice is for text or array only. Need to change card number from number to text. Add ''for 4533787178994213. 
+//slice is for text or array only. Need to change card number from number to text. use toString() to convert cardNumber
+//from integer to string.