fix error 3

Author: Alaterry8

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

@@ -1,9 +1,14 @@
-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
+
+// My prediction is that the code won't work since the .slice function searches the index to find the selected letters and -4 does not exist in an index
+// I have ran the code and found that the function is not working, due to missing quotation marks for cardNumber variable which means it was not a string
+// I have learned that a minus can be used to slice the latter indexes of a string