Saw someone wishing for method cascading in Ruby and wanted to play around with the idea ...

cascade.rb

# define
class Object
  def cascade(method_name, *args, &block)
    self.send(method_name, *args, &block)
    self
  end

  # catch the cascade
  def method_missing(method_name, *args, &block)
    sig = /^__/
    if method_name =~ sig
      new_method = method_name.to_s.gsub!(sig, "")
      cascade new_method.to_sym, *args, &block
    else
      super
    end
  end
end


class A
  attr_accessor :name
  attr_accessor :description

  def set_name(n)
    self.name = n
  end
end


a = A.new

# Call it directly
a.cascade(:name=, "Don")
  .cascade(:description=, "Some guy")

puts a.inspect
#=> #<A:0x007fb53c873f40 @name="Don", @description="Some guy">

a = A.new

# method missing
a.__set_name("Ernie")
  .__description=("Another guy")

puts a.inspect
#=> #<A:0x007fb53c873d88 @name="Ernie", @description="Another guy">