predict and explain the error in the code, and update the expression to get the correct value

Author: rahanasuleiman8-ship-it

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

@@ -1,9 +1,21 @@
-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
+
+//Prediction: The code won't work because cardNumber is stored as a Number and not a string, this is because '.slice()' is a string method 
+
 // Before running the code, make and explain a prediction about why the code won't work
+// Numbers in JavaScript don't work with '.slice()'
+
+
 // Then run the code and see what error it gives.
+//This is the 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?
+
+//Explanation: Yes, my prediction was accurate. JavaScript threw a TypeError because '.slice()' is a string method 
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+const cardNumber = '4533787178994213';
+const last4Digits = cardNumber.slice(-4);
+
+// console.log(last4Digits);