3.js

const cardNumber = 4533787178994213;
const last4Digits = String(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

// slice() is a String method, but cardNumber is a data of type Number, so we cannot use String methods on it.
// A simple solution is to transform cardNumber into a string using the string constructor String()