http://blog.darkhax.com/2009/12/18/my-ruby-style

style.rb

class Foo
  def initialize(a, business = 1, charlie = 2)
    @a = a
    @business = business
    @charlie = charlie
  end

  def bar
    # do stuff
    @a = 1 + 1
  rescue
    nil
  end

  def biz
    something_expensive(1,2)
  rescue FooError => e
    log(e)
  rescue BarError => e
    remote_log(e)
  end

  class << self
    def build
      Foo.new(1)
    end

    def build_other
      DEFAULTS.each do |d|
        process(d)
      end
      Foo.new(2)
    end

    def pickle
      Other.build.try(:pickle)
    end
  end

private

  def baz(time)
    self.time = time
  end
end