A class can do everything that a structure can do except that a class can use something called inheritance. A class can inherit the functionality from another class and then extend or customize its behavior. Let's jump right into some code.
Firstly, let's define a class called Building that we can inherit from later:
class Building {
let squareFootage: Int
init(squareFootage: Int) {
self.squareFootage = squareFootage
}
}
var aBuilding = Building(squareFootage: 1000)Predictably, a class is defined using the class keyword instead of struct. Otherwise, a class looks extremely similar to a structure. However, we can also see one difference. With a structure, the initializer we created before would not be necessary because it would have been created for us. With classes, initializers are not automatically created unless all of the properties have default values.
Now let's look at how to inherit from this building class:
class House: Building...