Refactoring in Swift - Inline class

This method of refactoring is just the opposite of Extract class.

Think of a class that became so small and so unused that it does not justify its existence.

Consider an application that has the following classes:


class User {
    var firstName, lastName: String?
    var homeAddress = Address()
...
}

class Address {
    var streetName, streetNumber, city, postalCode, country: String?
    var email: String?
...}

Because all the users are now virtual, keeping the physical address is not needed so our Address class becomes:

class Address {
    var email: String?
}

Such a class does not deserve to live, so we can remove it from the face of the earth and move its only property, email, into the User class:

class User {
    var firstName, lastName, email: String?
...
}