Fix cardNumber definition to use string format and ensure last4Digits extraction works correctly

Author: Monsur0001

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

@@ -1,9 +1,22 @@
-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
+
+The code is not working because the "slice" method is being used incorrectly. The "slice" 
+method should be called on the string "cardNumber" to extract the last 4 digits. However, 
+if there is a syntax error or if the variable "cardNumber" is not defined correctly, it could lead to an error.
+
 // 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?
+It gives an error because the "slice" method is being called on a string, but if the string is not defined correctly or 
+if there is a typo in the variable name, it will result in an error. This is what I predicted, as 
+I anticipated that the issue would be related to how the "slice" method is being used on the string.
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+I updated the expression to correctly use the "slice" method on the "cardNumber" string. I converted the cardNumber to a 
+string with the ("") and then used the slice method to extract the last 4 digits.