One-liner method definition in Ruby

colon_equal.rb

module OneLinerExamples
  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/request.rb#L150-L155
  def body            := get_header(RACK_INPUT)
  def script_name     := get_header(SCRIPT_NAME).to_s
  def script_name=(s) := set_header(SCRIPT_NAME, s.to_s)

  def path_info     := get_header(PATH_INFO).to_s
  def path_info=(s) := set_header(PATH_INFO, s.to_s)

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L126-L129
  def has_header?(key)   := headers.key? key
  def get_header(key)    := headers[key]
  def set_header(key, v) := headers[key] = v
  def delete_header(key) := headers.delete key

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L135-L156
  def invalid?             := status < 100 || status >= 600

  def informational?       := status >= 100 && status < 200
  def successful?          := status >= 200 && status < 300
  def redirection?         := status >= 300 && status < 400
  def client_error?        := status >= 400 && status < 500
  def server_error?        := status >= 500 && status < 600

  def ok?                  := status == 200
  def created?             := status == 201
  def accepted?            := status == 202
  def no_content?          := status == 204
  def moved_permanently?   := status == 301
  def bad_request?         := status == 400
  def unauthorized?        := status == 401
  def forbidden?           := status == 403
  def not_found?           := status == 404
  def method_not_allowed?  := status == 405
  def precondition_failed? := status == 412
  def unprocessable?       := status == 422

  def redirect?            := [301, 302, 303, 307, 308].include? status

  # https://github.com/rails/rails/blob/24c1429a/actionpack/lib/action_dispatch/http/response.rb#L219-L221
  def sending?   := synchronize { @sending }
  def committed? := synchronize { @committed }
  def sent?      := synchronize { @sent }
end

double_colons.rb

module OneLinerExamples
  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/request.rb#L150-L155
  def body::            get_header(RACK_INPUT)
  def script_name::     get_header(SCRIPT_NAME).to_s
  def script_name=(s):: set_header(SCRIPT_NAME, s.to_s)

  def path_info::     get_header(PATH_INFO).to_s
  def path_info=(s):: set_header(PATH_INFO, s.to_s)

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L126-L129
  def has_header?(key)::   headers.key? key
  def get_header(key)::    headers[key]
  def set_header(key, v):: headers[key] = v
  def delete_header(key):: headers.delete key

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L135-L156
  def invalid?::             status < 100 || status >= 600

  def informational?::       status >= 100 && status < 200
  def successful?::          status >= 200 && status < 300
  def redirection?::         status >= 300 && status < 400
  def client_error?::        status >= 400 && status < 500
  def server_error?::        status >= 500 && status < 600

  def ok?::                  status == 200
  def created?::             status == 201
  def accepted?::            status == 202
  def no_content?::          status == 204
  def moved_permanently?::   status == 301
  def bad_request?::         status == 400
  def unauthorized?::        status == 401
  def forbidden?::           status == 403
  def not_found?::           status == 404
  def method_not_allowed?::  status == 405
  def precondition_failed?:: status == 412
  def unprocessable?::       status == 422

  def redirect?::            [301, 302, 303, 307, 308].include? status

  # https://github.com/rails/rails/blob/24c1429a/actionpack/lib/action_dispatch/http/response.rb#L219-L221
  def sending?::   synchronize { @sending }
  def committed?:: synchronize { @committed }
  def sent?::      synchronize { @sent }
end

single_colon.rb

module OneLinerExamples
  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/request.rb#L150-L155
  def body:            get_header(RACK_INPUT)
  def script_name:     get_header(SCRIPT_NAME).to_s
  def script_name=(s): set_header(SCRIPT_NAME, s.to_s)

  def path_info:     get_header(PATH_INFO).to_s
  def path_info=(s): set_header(PATH_INFO, s.to_s)

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L126-L129
  def has_header?(key):   headers.key? key
  def get_header(key):    headers[key]
  def set_header(key, v): headers[key]: v
  def delete_header(key): headers.delete key

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L135-L156
  def invalid?:             status < 100 || status >= 600

  def informational?:       status >= 100 && status < 200
  def successful?:          status >= 200 && status < 300
  def redirection?:         status >= 300 && status < 400
  def client_error?:        status >= 400 && status < 500
  def server_error?:        status >= 500 && status < 600

  def ok?:                  status == 200
  def created?:             status == 201
  def accepted?:            status == 202
  def no_content?:          status == 204
  def moved_permanently?:   status == 301
  def bad_request?:         status == 400
  def unauthorized?:        status == 401
  def forbidden?:           status == 403
  def not_found?:           status == 404
  def method_not_allowed?:  status == 405
  def precondition_failed?: status == 412
  def unprocessable?:       status == 422

  def redirect?:            [301, 302, 303, 307, 308].include? status

  # https://github.com/rails/rails/blob/24c1429a/actionpack/lib/action_dispatch/http/response.rb#L219-L221
  def sending?:   synchronize { @sending }
  def committed?: synchronize { @committed }
  def sent?:      synchronize { @sent }
end

single_equal.rb

module OneLinerExamples
  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/request.rb#L150-L155
  def body            = get_header(RACK_INPUT)
  def script_name     = get_header(SCRIPT_NAME).to_s
  def script_name=(s) = set_header(SCRIPT_NAME, s.to_s)

  def path_info     = get_header(PATH_INFO).to_s
  def path_info=(s) = set_header(PATH_INFO, s.to_s)

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L126-L129
  def has_header?(key)   = headers.key? key
  def get_header(key)    = headers[key]
  def set_header(key, v) = headers[key] = v
  def delete_header(key) = headers.delete key

  # https://github.com/rack/rack/blob/f9ad97fd/lib/rack/response.rb#L135-L156
  def invalid?             = status < 100 || status >= 600

  def informational?       = status >= 100 && status < 200
  def successful?          = status >= 200 && status < 300
  def redirection?         = status >= 300 && status < 400
  def client_error?        = status >= 400 && status < 500
  def server_error?        = status >= 500 && status < 600

  def ok?                  = status == 200
  def created?             = status == 201
  def accepted?            = status == 202
  def no_content?          = status == 204
  def moved_permanently?   = status == 301
  def bad_request?         = status == 400
  def unauthorized?        = status == 401
  def forbidden?           = status == 403
  def not_found?           = status == 404
  def method_not_allowed?  = status == 405
  def precondition_failed? = status == 412
  def unprocessable?       = status == 422

  def redirect?            = [301, 302, 303, 307, 308].include? status

  # https://github.com/rails/rails/blob/24c1429a/actionpack/lib/action_dispatch/http/response.rb#L219-L221
  def sending?   = synchronize { @sending }
  def committed? = synchronize { @committed }
  def sent?      = synchronize { @sent }
end