Ruby | Range | begin or first

概要

Range#begin -> object
Range#first -> object
Range#first(n) -> [object]

詳細

始端の要素を返却

サンプルコード

require 'tbpgr_utils'

bulk_puts_eval binding, <<-EOS
(2..5).begin
(2..5).first
(2..5).first(2)
(2..1).first
(2..1).first(1)
EOS

__END__
下記はTbpgrUtils gemの機能
bulk_puts_eval

https://rubygems.org/gems/tbpgr_utils
https://github.com/tbpgr/tbpgr_utils

出力

(2..5).begin    # => 2
(2..5).first    # => 2
(2..5).first(2) # => [2, 3]
(2..1).first    # => 2
(2..1).first(1) # => []

参照

http://docs.ruby-lang.org/ja/2.1.0/method/Range/i/begin.html