わーい、すごーい

class Friends
    let env: Env
    var message: String
    new create(env': Env) =>
        env = env'
        message = ""

    fun ref wai(): Friends =>
        message = message.add("わーい\n")
        this

    fun ref sugoi(): Friends =>
        message = message.add("すごーい\n")
        this

    fun ref tanoshii(): Friends =>
        message = message.add("たのしー\n")
        this

    fun ref friends(skill: String): Friends =>
        message = message.add("君は" + consume skill + "がとくいなフレンズなんだね!!")
        this

    fun string(): String =>
        message

actor Main
    new create(env: Env) =>
        env.out.print(Friends(env).wai().sugoi().tanoshii().friends("クソリプ").string())

元ネタ: http://qiita.com/t_ishida/items/bae7e62950d81f427f13