Lesson 3: Two Dogs - Structs and Classes

Two Dogs Build two independent values from one struct.

1struct Dog {

2 var name: String

5let rex = Dog(name: "Rex")

6let bella = Dog(name: "Bella")

7print(rex.name)

8print(bella.name)

Terminal

$ swift main.swift

Rex

Bella

Every line, explained

struct Dog {: struct Dog { ... } defines a struct: a blueprint bundling values that belong together. Swift developers reach for structs first when they want to model a "thing".
var name: String: A variable inside a struct is called a property; every Dog gets its own.
}: This } closes the struct.
let rex = Dog(name: "Rex"): One struct definition...
let bella = Dog(name: "Bella"): ...as many values as you like. Think of one house plan and a whole street of houses. bella's name is completely separate from rex's.
print(rex.name): print(...) works exactly as in Intro to Swift.
print(bella.name): print(...) works exactly as in Intro to Swift. Two values, two different names.