Scala - Core Scala - More Collections(Array collections, java.io.File().listFiles, map, mkString)

Learning Scala:
Practical Functional Programming for the JVM
(O'Reilly Media)
Jason Swartz (著)

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• Scala (プログラミング言語)

Learning Scala: Practical Functional Programming for the JVM (Jason Swartz (著)、O'Reilly Media)のPart Ⅰ. (Core Scala)、Chapter 7.(More Collections)、Exercises 2.(No. 3195)を解いてみる。

その他参考書籍

• Programming Scala: Scalability = Functional Programming + Objects

Exercises 2.(No. 3195)

コード(Emacs)

var directories =
  new java.io.File(".").
    listFiles.map(_.toString.replace("./", "")).
    filter(_.head != '.').
    mkString(";")

println(directories)

入出力結果(Terminal, REPL(Read, Eval, Print, Loop))

$ scala-2.11 sample2.scala
#draft.html#;draft.html;draft.html~;draft1_a.html;draft1_b.html;draft1_c.html;draft1_d.html;output.txt;output.txt~;sample1_a.scala;sample1_a.scala~;sample1_b.scala;sample1_b.scala~;sample1_c.scala;sample1_c.scala~;sample1_d.scala;sample1_d.scala~;sample2.scala;sample2.scala~
$