Monthnames.rb

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このスクリプトは Date::MONTHNAMES を参照し、[nil, "January", ..., "December"] の配列を取得します。先頭が nil のため添字がそのまま月番号(1〜12)に対応し、Date::MONTHNAMES[date.month] のように使えます。

require 'date'
#=> true
Date::MONTHNAMES
#=> [nil,
 "January",
 "February",
 "March",
 "April",
 "May",
 "June",
 "July",
 "August",
 "September",
 "October",
 "November",
 "December"]

Ruby 4.0.6