ruby-dev

石橋"rubyholic"秀仁です。

Array#index(val) の逆で「nth 番目の要素を返す」メソッドはありますか？
ようするに self[nth] なのですが、演算子ではなくて。

次は self[nth] を使ったコードの例です。
 filename = '/home/hideto/ruby/script/this.is.test.rb'
 basename = filename.split('/')[-1].split('.')[0...-1].join('.')
 p basename  # => "this.is.test"
パイプラインの途中に ")[" というのがあります。
ドット "." が無くて、すこし気持ちわるいです。

これを、
 basename =
   filename.split('/').value(-1).split('.').value(0...-1).join('.')
 p basename  # => "this.is.test"
のように書きたいのです。メソッド名はなんでもいいのですが・・・

 class Array
   alias value []
   alias value_at []  # 'at' じゃ Range のときにおかしい？
 end

ぼくは method(arg)[nth].method という形に違和感があります。
マイナーな悩みでしょうか (^^;

--
Hideto "rubyholic" ISHIBASHI
http://www.rr.iij4u.or.jp/~hideto-i/
blade clone (yaiba) development:
http://www.rr.iij4u.or.jp/~hideto-i/rb/yaiba/index.html

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