Benchmark: Hash to JSON convertation methods

bm_hash_to_json.rb

require 'benchmark'
require 'json/ext'

iterations = 1_000_000

hash = { who: 'Me', first_name: 'Alexey', last_name: 'Black', title: 'Doctor',
         birthdate: Time.now, favorite_color: 'transparent', car: 'BMW', hands: 2,
         city: 'Quanzi', planet: 'Third' }

Benchmark.bm(27) do |bm|
  bm.report('hash.to_json') do
    iterations.times do
      hash.to_json
    end
  end

  bm.report('string interpolation') do
    iterations.times do
      "who: #{hash[:who]} first_name: #{hash[:first_name]} last_name: #{hash[:last_name]} \
      title: #{hash[:title]} birthdate: #{hash[:birthdate]} favorite_color: #{hash[:favorite_color]}\
      car: #{hash[:car]} hands: #{hash[:hands]} city: #{hash[:city]} planet: #{hash[:planet]}"
    end
  end

  bm.report('string#format') do
    iterations.times do
      format "who: %{who} first_name: %{first_name} last_name: %{last_name} \
      title: %{title} birthdate: %{birthdate} favorite_color: %{favorite_color}\
      car: %{car} hands: %{hands} city: %{city} planet: %{planet}", hash
    end
  end
end

#                                   user     system      total        real
# hash.to_json                 11.930000   0.050000  11.980000 ( 12.069950)
# string interpolation          3.350000   0.030000   3.380000 (  3.437143)
# string#format                 4.950000   0.020000   4.970000 (  4.993995)

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