Rubyの最長APIを探してみた ref: http://qiita.com/kachick@github/items/68612dd66bb1cf764265

find_longest_api.rb

# find_longest_api_name
# 2013 Kenichi Kamiya
# ruby -v: ruby 2.1.0dev (2013-08-10 trunk 42476) [x86_64-linux]

$VERBOSE = true

class BasicObject
  def longest_method_name
    (methods(true) | private_methods(true)).reject { |name|
      /\Alongest_(?:instance_)?method_name\z/ =~ name }.max_by(&:length)
  end
end

class Module
  def longest_instance_method_name
    (instance_methods(true) | private_instance_methods(true)).reject { |name|
      /\Alongest_(?:instance_)?method_name\z/ =~ name }.max_by(&:length)
  end

  def longest_api(ignore_modules=[])
    apis = [[name, longest_instance_method_name].join('#')]
    constants.each do |const_name|
      const = const_get const_name
      if const.kind_of?(Module) && !ignore_modules.include?(const)
        apis << [const.name, longest_method_name].join('.')
        ignore_modules << const
        apis << const.__send__(__callee__, ignore_modules)
      else
        apis << [[name, const_name].join("::"), longest_method_name].join('.')
      end
    end

    apis.max_by(&:length)
  end
end

p Object.longest_api
#=> Gem::Specification::NONEXISTENT_SPECIFICATION_VERSION.outdated_and_latest_version