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Structs are copy by value, can't inherit, but can
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conform to protocols
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struct Work {
var location = ""
var units = [String]()
let length: Int
func last() -> String {
return units[units.count - 1]
}
}
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Structs have handy memberwise initializers.
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All properties must be specified.
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var work = Work(location: "office", units: ["answer phone", "read book"], length: 8)
print(work.location) // office
print(work.units[0]) // answer phone
print(work.last()) // read book
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# Type Properties
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AKA static variables
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struct Play {
static var duration = 1
static var name: String { // Read-only computed type property
return String("named \(duration + 1)")
}
static var activity: String {
get {
return name + "stargaze"
}
set {
duration = 2
}
}
}
print(Play.duration) // 1
print(Play.name) // named 2
print(Play.activity) // named 2stargaze
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# Instance methods
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struct Mansion {
var rooms = 30
var garageDoors = 5
// Methods cannot modify value types without
// declaring so via the `mutating` keyword.
mutating func addGarage (newVal: Int) {
garageDoors += newVal
}
}
var mansion = Mansion()
mansion.addGarage(5)
print(mansion.garageDoors) // 10
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# Type Methods
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AKA static methods
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struct Font {
static var size = 12
var typeface = ""
static func pointSize() -> String {
return "\(size)pt"
}
}
print(Font.pointSize()) // 12pt
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