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instance method · added in Ruby 3.2

Module#const_added

const_added(const_name)

#define rb_obj_mod_const_added rb_obj_dummy1

Invoked as a callback whenever a constant is assigned on the receiver

Example

module Chatty
  def self.const_added(const_name)
    super
    puts "Added #{const_name.inspect}"
  end
  FOO = 1
end

produces:

Example

Added :FOO

Ruby version changes

See also #class_variable_set #constants #class_variables #const_defined? also in 4.1 · 4.0 · 3.4 · 3.3