This document discusses enumerations in Swift, including defining an enumeration, assigning values to enumeration cases, and using enumerations for type safety. It shows examples of defining an enumeration for compass directions and using a switch statement or if statement to check the value. It also demonstrates defining an enumeration for movie genres and using it as the type for a property in a Movie struct.

1. Unit 3—Lesson 5:
Enumerations

2. Enumerations

3. Enumerations
enum CompassPoint {
case north
case east
case south
case west
}

4. Enumerations
enum CompassPoint {
case north, east, south, west
}
var compassHeading = CompassPoint.west
var compassHeading: CompassPoint = .west
compassHeading = .north

5. Control flow
let compassHeading: CompassPoint = .west
switch compassHeading {
case .north:
print("I am heading north")
case .east:
print("I am heading east.")
case .south:
print("I am heading south")
case .west:
print("I am heading west")
}

6. Control flow
let compassHeading: CompassPoint = .west
if compassHeading == .west {
print("I am heading west")
}

7. Type safety benefits
struct Movie {
var name: String
var releaseYear: Int
var genre: String
}
let movie = Movie(name: "Finding Dory", releaseYear: 2016, genre: "Aminated")

8. Type safety benefits
enum Genre {
case animated, action, romance, documentary, biography, thriller
}
struct Movie {
var name: String
var releaseYear: Int
var genre: Genre
}
let movie = Movie(name: "Finding Dory", releaseYear: 2016, genre: .animated)

9. Lab: Enumerations
Unit 3—Lesson 5
Open and complete the exercises in Lab - Enumerations.playground

10. © 2017 Apple Inc.
This work is licensed by Apple Inc. under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.