struct.swift

struct Dog {
    var name: String
    var type: String    
    init(name: String, type: String) {
        self.name = name
        self.type = type
    }
}

var aDog = Dog(name: "Bugsy", type: "Pug")
var bDog = aDog
bDog.name = "Mugsy" // Bugsy's brother

println(aDog.name) // "Bugsy"
println(bDog.name) // "Mugsy"