3.js

const cardNumber = 4533787178994213;
const last4Digits = Number(cardNumber.toString().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


// I predict an error will happen because cardNumber is a number and not a string and slice can not be used for pure numbers.
// We can fix it by turning the number into a string by using .toString() before we slice it.

console.log("The last four digits are: " + last4Digits);
console.log("This is a " + typeof last4Digits)