Complex data types

// ARRAYS
let john = "John Lennon"
let paul = "Paul McCartney"
let george = "George Harrison"
let ringo = "Ringo Starr"
let beatles: [String] = [john, paul, george, ringo]
beatles[0] // "John Lennon"

// Create empty array
let bands = [String]()
let bands2 = Array<String>()

// SETS
let colors = Set(["red", "green", "blue"])
let color2 = Set(["red", "green", "blue", "red"]) // "red" only included once

// Creare empty set
var words = Set<String>()

// TUPLES
var name = (first: "Taylor", last: "Swift")
name.0 // "Taylor"
name.last // "Swift"
name.last = "Beiber"
name // (first "Taylor", last "Beiber")

//DICTIONARIES
let heights = [
    "Taylor Swift": "1.78",
    "Ed Sheeran": "1.73"
]
heights["Taylor Swift"] // "1.78"
heights["Celine Dion", default: "unknown"] // "unknown"

// Create empty dictionary
var teams = [String: String]()
teams["Greg"] = "Montreal Canadiens"
var teams2 = Dictionary<String, String>() // Alternative

// ENUMERATIONS
enum Result {
    case success
    case failure
}
let result4 = Result.failure

// Associated values
enum Activity {
    case bored
    case running(destination: String)
    case talking(topic: String)
    case singing(volume: Int)
}
let talking = Activity.talking(topic: "movies")

// Raw values
enum Planet: Int {
    case mercury = 1
    case venus
    case earth
    case mars
}
let earth = Planet(rawValue: 3)