inquiry.rb

require 'active_support/core_ext/string/inquiry.rb'

def speak_like_a(val)
  is = val.inquiry
  if is.chicken?
    puts "bagaaawk"
  elsif is.pig?
    puts "oink"
  else
    puts "sorry don't know what tongue that speak in"
  end
end

speak_like_a "chicken" # => "bagaaawk"
speak_like_a "pig"     # => "oink"
speak_like_a "wombat"  # => "sorry don't know what tongue that speaks in"