tbpg https://blog.hatena.ne.jp/tbpg/ Tbpgr Blog https://tbpgr.hatenablog.com/ Ruby 概要 Module#class_variable_defined?(name) -> bool 詳細 name で与えられた名前のクラス変数が存在する場合 true を 返却。 サンプルコード require 'tbpgr_utils' module Hogeable @@hoge = 1 end class Hoge @@hoge = 2 end class Hige include Hogeable end class Hage end bulk_puts_eval binding, <<-EOS Hoge.class_variable_defined? :@@hoge Hige.clas… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftbpgr.hatenablog.com%2Fentry%2F20140711%2F1405082021" title="Ruby | Module | class_variable_defined? - Tbpgr Blog" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2014-07-11 21:33:41 rich https://tbpgr.hatenablog.com/entry/20140711/1405082021 1.0 100%