Fix last4Digits assignment for cardNumber

Updated last4Digits assignment to convert cardNumber to string before slicing.

Author: Rawan0-0

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

@@ -1,10 +1,13 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
-
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);
+//the output is 4213
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Before running the code, make and explain a prediction about why the code won't work
+//it won't work because cardNumber is not a string
 // Then run the code and see what error it gives.
+//TypeError: cardNumber.slice is not a function so a string method can't br used with it
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+// The error is caused because card number is a number not a string and toString is a string method so its a different type of data
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
-// in this case its a reference error the program is trying to access a value that wasn't declared. In this case a variable.