3.js completed

Author: codebyshay

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

@@ -1,9 +1,20 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+// const cardNumber = 4533787178994213;
+// const last4Digits = cardNumber.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
 // 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
+
+// Prediction: The code will not work because slice() is being used on cardNumber, which is a number.
+// The slice() method only works on strings or arrays, not numbers.
+// So I predict JavaScript will throw an error saying that slice is not a function for a number.
+
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);
+
+// After running the code, I got the output "4213", which is the last 4 digits of the card number.
+// This is what i expected.