Examples

require "use"

module Mod_A
   def meth_a
      "hello"
   end
   def meth_b
      "world"
   end
end

module Mod_B
   def meth_a
      "goodbye"
   end
   def meth_b
      "new york"
   end
   def meth_c
      "adios"
   end
end

# Various ways to mixin methods using ‘use’. Note that
# I am intentionally putting multiple ‘use’ statements
# within the classes for the sake of brevity and demonstration. In
# practice, you would not use more than one per module.

class Foo
   use Mod_A                        # include all methods from Mod_A
   use Mod_A, :meth_a               # or, include only 'meth_a' from Mod_A
   use Mod_A, :include => :meth_a   # same as above
end

class Bar
   use Mod_B, :include => [:meth_a, :meth_b] # include only 'meth_a' and 'meth_b'
   use Mod_B, :exclude => :meth_c            # same net result as above
end

class Baz
   use Mod_A, :meth_a                        # mixin 'meth_a' from Mod_A
   use Mod_B, :alias => {:meth_a, :meth_z}   # mixin 'meth_a' from Mod_B, but as 'meth_z'
end

# Alias every method from Mod_B, and mixin Mod_A‘s 'meth_b'.
class Zap
   use Mod_B, :alias => {
      :meth_a => :meth_x,
      :meth_b => :meth_y,
      :meth_c => :meth_z
   }

   use Mod_A, :meth_b
end