require 'rubygems'
require 'bson'
require 'benchmark'


TRIALS = 1000
ARRAY_LENGTH = 1_000_000

class Bar

end

class Foo
  def delete_at_test ary, delete_indexes
    delete_indexes.each { |index| ary.delete_at index }
  end

  def shift_test ary
    ary.shift
    ary.shift
    ary.shift
    ary.shift
    ary.shift
    ary.shift
  end

  def slice_test ary
    ary.slice! 0, 6
  end

  def big_array
    ary = []
    ARRAY_LENGTH.times { ary << Bar.new }
    ary
  end
end

foo = Foo.new

a = foo.big_array
b = foo.big_array
c = foo.big_array

Benchmark.bmbm(22) do |x|


  x.report('delete_at') do
    delete_indexes = [0,1,2,3,4,5,6].reverse
    TRIALS.times do
      foo.delete_at_test a, delete_indexes
    end
  end

  x.report('shift test') do
    TRIALS.times do
      foo.shift_test b
    end
  end

  x.report('slice test') do
    TRIALS.times do
      foo.slice_test c
    end
  end

end