converted cardNumber to string to achieve desired output and included comments

Author: Alex-Os-Dev-Lab

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

@@ -1,9 +1,19 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
 
+console.log(last4Digits);
+
 // 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
 // Then run the code and see what error it gives.
 // 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
+
+// initial prediction:
+// I don't think the code will work because cardNumber is a number, and the slice method is a string method.
+
+// The error I get is: TypeError: cardNumber.slice is not a function
+
+// This error is happening because the slice method is being called on a number,
+// which does not have the slice method. The slice method is only available for strings and arrays.