Method call.

 Book.example

If it is an absolute path, it can be written as follows.

 ::Book.example

This is useful, for example, when calling a class of the same name from within a module.

 class Book def self.example p 'Class' end end module Example class Book #このモジュールの example を呼ぶ def self.call_module_method Book.example end # 普通のClass の example を呼ぶ def self.call_class_method ::Book.example end def self.example p 'Module' end end end Example::Book.call_module_method Example::Book.call_class_method

Execution result

 "Module" "Class"

I don't know if the word "absolute path" is correct or not, but I had a hard time knowing the keyword when I was making a note.
I thought I could call it in Class::Book.example but it was different. (The part of Class is ignored)

Original by

Ruby: 絶対パスでメソッドを呼び出す。

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