shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ Scala Scalaコレクションメソッドメモ(Hishidama's Scala collection method Memo) filterとmapを組み合わせたやつなので、こんな感じでfilterぽくかけるしmapぽくもかける。 Traversableなので、ListでもMapでもいける。 scala> val m = Map("name" -> "hoge", "currency" -> Some("USD")) m: scala.collection.immutable.Map[String,java.io.Serializable] = Map(name -> hoge, currency -… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2Fscala_map_collect" title="Mapでcollect - 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 2015-11-27 22:57:00 rich https://www.shigemk2.com/entry/scala_map_collect 1.0 100%