snippets.rb

# http://melborne.github.io/2012/07/12/object-repeat-take-care-of-sequence/

class Object
  def repeat(init=true, &blk)
    x = self
    Enumerator.new do |y|
      y << x if init
      loop { y << (x = yield x) }
    end
  end
end

tricks.rb

c = '@'
60.times.map { c = c.succ }