hello Swift

hello.swift

protocol Greeter {
    func greet() -> String
}

protocol エンジニャー {
    func meo()
}

class Person: Greeter {
    var name: String = "kitamura"
    var age: Int?
    
    init() {}
    
    init(name: String) {
        self.name = name
    }
    
    func greet() -> String {
        return name
    }
    
    func hello() {
        println("hello " + greet())
    }
}

// extend Person
extension Person: エンジニャー {
    func meo() {
        println(name + " にゃーん")
    }
}

// extend again
extension Person {
    convenience init(name: String, age: Int) {
        self.init(name: name)
        self.age = age
    }
}

var person = Person()
println(person.greet()) // kitamura
person.hello() // hello kitamura

// set name
person = Person(name: "hoge")
person.hello() // hello hoge

// set age
person = Person(name: "satoshi", age: 30)
person.meo() // satoshi にゃーん