Ruby's safe navigation operator is used to access a method on an object that
might be undefined. Say we want to get the full address of a user's company.
It would look something like this: user.company.full_address
But what if not all users have a company? The user.company would be nil. And
then we would be trying to access the method full_address on nil. Ultimately
we would be left with the following error: Undefined method 'full_address' for nil:NilClass
We can use a safe navigation operator to prevent this error. We would write
user.company&.full_address. This would allow us to get the full_address,
only if the user.company was not nil.