$OFS -> String | nil[permalink][rdoc][edit] [added by English]$OUTPUT_FIELD_SEPARATOR -> String | nil[added by English]-
$, の別名
require "English" array = %w|hoge fuga ugo bar foo| p array.join #=> "hogefugaugobarfoo" $OUTPUT_FIELD_SEPARATOR = "," p array.join #=> "hoge,fuga,ugo,bar,foo"