Fix last4Digits assignment to correctly use slice on string representation of cardNumber

Author: Monsur0001

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

@@ -1,9 +1,21 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
 
 // 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
+
+The code didnt work because the slice method was called on an integer (cardNumber), 
+but slice is a method that is only available for strings and arrays. 
+Since cardNumber is an integer, it does not have the slice method, 
+which will result in an error when the code is run.
+
 // Then run the code and see what error it gives.
+The error was: TypeError: cardNumber.slice is not a function
+
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+It gives this error because the slice method is not meant for numbers. This is what I predicted, as I expected that calling slice on an integer would result in a TypeError.
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+const last4Digits = cardNumber.toString().slice(-4);