Speed test for two digg implementations

digg_benchmark.rb

module Digg

  class Digger

    attr_reader :path

    def initialize(*path)
      @path = path
    end

    def call(matter)
      path.inject(matter) do |memo, key|
        (memo.respond_to?(:[]) && memo[key]) || break
      end
    end
  end
  
  module Core

    def digg(*path)
      path.inject(self) do |memo, key|
        (memo.respond_to?(:[]) && memo[key]) || break
      end
    end

  end
end

Array.send :include, Digg::Core
Hash.send :include, Digg::Core

require 'open-uri'
require 'json'

people_json = []
open('http://api.randomuser.me/?results=100') do |f|
  people_json << JSON.parse( f.read )
end

require 'benchmark/ips'

path = [0, 'results', 5, 'user', 'name', 'first']
digger = Digg::Digger.new(0, 'results', 5, 'user', 'name', 'first')

Benchmark.ips do |x|
  
  x.report("people_json.digg(...)") do
    people_json.digg(0, 'results', 5, 'user', 'name', 'first')
  end
  
  x.report("people_json.digg(*)") do
    people_json.digg(*path)
  end

  x.report("digger.call(...)") do
    digger.call(people_json)
  end

  x.compare!
end

result.log

Calculating -------------------------------------
    people_json.digg    23.540k i/100ms
 people_json.digg(*)    22.190k i/100ms
    digger.call(...)    19.954k i/100ms
-------------------------------------------------
    people_json.digg    269.242k (±18.4%) i/s -      1.295M
 people_json.digg(*)    301.677k (±14.2%) i/s -      1.465M
    digger.call(...)    341.138k (±12.6%) i/s -      1.696M

Comparison:
    digger.call(...):   341137.8 i/s
 people_json.digg(*):   301677.0 i/s - 1.13x slower
    people_json.digg:   269241.8 i/s - 1.27x slower