shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ Scala scala> var list1 = List("Scala") list1: List[String] = List(Scala) scala> list1 = ("Ruby" +: list1) list1: List[String] = List(Ruby, Scala) scala> list1 res8: List[String] = List(Ruby, Scala) 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F2014%2F07%2F02%2F%25E3%2583%25AA%25E3%2582%25B9%25E3%2583%2588%25E3%2581%25AE%25E8%25BF%25BD%25E5%258A%25A0" title="リストの追加 - by shigemk2" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2014-07-02 00:15:34 rich https://www.shigemk2.com/entry/2014/07/02/%E3%83%AA%E3%82%B9%E3%83%88%E3%81%AE%E8%BF%BD%E5%8A%A0 1.0 100%