2-mandatory-error fix

Author: AdnaanA

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

@@ -1,9 +1,21 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
+
 // However, the code isn't working
+// the error is that slice is not a function for numbers, it is a function for strings and arrays
+
 // Before running the code, make and explain a prediction about why the code won't work
+// My prediction is that the code will give an error because slice is not a function for numbers
+
 // Then run the code and see what error it gives.
+// 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 slice is not a function for numbers, it is a function for strings and arrays. This is what I predicted.
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+const cardNumberString = cardNumber.toString();
+const last4DigitsCorrected = cardNumberString.slice(-4);
+console.log(last4DigitsCorrected); // Should print 4213