Swift Functional Programming - Second Edition

Objects

In an OOP application, objects are the runtime entities or instances that take space in memory, and more specifically, in the heap. Objects have an associated/allocated memory address to store their state and a set of functions or methods that define the suitable operations on the object state. In short, in OOP, an object encapsulates state and behavior.

To create an object, a blueprint or recipe is required, which is called a class in OOP.

The following section will explore the class concept in more detail. For now, we will define a very simple class in order to be able to talk about objects:

class User {     let name = "Constant name"     var age: Int = 0     func incrementUserAgeByOne() {         self.age += 1     } } 

In this example, name and ...