3.js

Author: Abayie

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

@@ -1,9 +1,27 @@
-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
+
+
+
+/* This code throws an error because `cardNumber` is a **number**, and numbers do not have a `.slice()` method—`.slice()` is a method for strings and arrays.
+
+**How to fix:**  
+Convert `cardNumber` to a string before using `.slice()`:
+
+````javascript
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
+````
+
+Now, `last4Digits` will correctly contain the last 4 digits as a string.*/
+
+const cardNumber = 4533787178994213;
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);