gistfile1.rb

class SortedArray < Array
  def <<(other)
    super
    sort!
  end

  def push(other)
    super
    sort!
  end
end

# BUT! SortedArray would then have all of the methods of Array, many of which
# don't make sense for a sorted array, like []=. Better would be to have it delegate:

class SortedArray < BasicObject
  include Forwardable

  def initialize(array)
    @array = array
  end

  def <<(other)
    @array << other
    @array.sort!
  end

  def_delegators :@array, :[], :length, :size # delegate useful methods to array here
end