pluckeroid-bench.rb

require 'benchmark/ips'
require 'active_support/hash_with_indifferent_access'
require 'active_support/core_ext/hash'

begin
  @attributes = [{ 'id' => 1, 'name' => 'Julia', 'created_at' => Time.now }] * 1000
  @mapping = { 'id' => 'user_id' }

  def sleep
    super 0.00000001 # typecasting simulation
  end

  def pluck_attributes1
    @attributes.map do |attributes|
      attributes.each do |key, value|
        attributes[key] = value
        sleep
      end
    end
  end

  def pluck_attributes_mapping
    @attributes.map do |attributes|
      mapped = {}
      attributes.each do |key, value|
        key_name = @mapping[key] || key
        mapped[key_name] = value
        sleep
      end
      mapped
    end
  end

  def pluck_attributes_hwia
    @attributes.map do |attributes|
      mapped = HashWithIndifferentAccess.new
      attributes.each do |key, value|
        mapped[key] = value
        sleep
      end
      mapped
    end
  end

  def pluck_attributes_hwia_mapping
    @attributes.map do |attributes|
      mapped = HashWithIndifferentAccess.new
      attributes.each do |key, value|
        mapped[@mapping[key] || key] = value
        sleep
      end
      mapped
    end
  end

  Benchmark.ips do |x|
    x.report('original') do
      pluck_attributes1
    end

    x.report('mapping') do
      pluck_attributes_mapping
    end

    x.report('hwia') do
      pluck_attributes_hwia
    end

    x.report('hwia+mapping') do
      pluck_attributes_hwia_mapping
    end
  end
end