# gem install benchmark-memory
require 'benchmark/memory'

Benchmark.memory do |x|
  Pair = Struct.new(:a, :b)

  x.report('two arrays') do
   array_1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
   array_2 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 end
  x.report('hash') do
    hash = { 1 => 1, 2 => 2, 3 => 3, 4 => 4, 5 => 5, 6 => 6, 7 => 7, 8 => 8, 9 => 9, 10 => 10 }
  end
  x.report('nested array') do
    array = [[1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [6, 6], [7, 7], [8, 8], [9, 9], [10, 10]]
  end
  x.report('struct') do
    array = [Pair.new(1, 1), Pair.new(2, 2), Pair.new(3, 3), Pair.new(4, 4), Pair.new(5, 5), 
             Pair.new(6, 6), Pair.new(7, 7), Pair.new(8, 8), Pair.new(9, 9), Pair.new(10, 10)]
  end
  x.compare!
end