Ruby object: hashing public attributes

x.rb

class MyClass
  PUBLIC_ATTRS = [ :alpha, :bravo, :charlie ].freeze

  attr_reader *PUBLIC_ATTRS

  def to_h
    PUBLIC_ATTRS.map do |var|
      [var, instance_variable_get("@#{var}")]
    end.to_h.with_indifferent_access
  end
end