sort_vs_sort_by.rb

output.txt

jeremy@ample-3:~/tmp ruby-2.1.5@default % ruby sort_vs_sort_by.rb
Rehearsal ------------------------------------------------------------------------------
#sort    array of hashes                     0.760000   0.010000   0.770000 (  0.759593)
#sort_by array of hashes                     0.290000   0.000000   0.290000 (  0.299255)
#sort    array of strings                    0.550000   0.000000   0.550000 (  0.554952)
#sort_by array of strings                    0.280000   0.000000   0.280000 (  0.276396)
#sort direct array of strings                0.100000   0.010000   0.110000 (  0.102575)
#sort_by array of strings(2) (no counting)   0.260000   0.000000   0.260000 (  0.266884)
--------------------------------------------------------------------- total: 2.260000sec

                                                 user     system      total        real
#sort    array of hashes                     0.720000   0.000000   0.720000 (  0.727211)
#sort_by array of hashes                     0.310000   0.000000   0.310000 (  0.302691)
#sort    array of strings                    0.540000   0.000000   0.540000 (  0.538158)
#sort_by array of strings                    0.270000   0.000000   0.270000 (  0.276805)
#sort direct array of strings                0.090000   0.000000   0.090000 (  0.098608)
#sort_by array of strings(2) (no counting)   0.270000   0.000000   0.270000 (  0.277430)

Block invocations counts
========================

#sort    array of hashes   : 9487000
#sort_by array of hashes   : 1000000
#sort    array of strings  : 9487000
#sort_by array of strings  : 1000000
j

sort_vs_sort_by.rb

#!/usr/bin/env ruby
#
# To help answer the question at:
#
# https://www.omniref.com/ruby/2.2.0/symbols/Enumerable/sort_by?oes=new_annotation#annotation=4074262A
#
#
require 'benchmark'
require 'securerandom'

iterations = (ARGV.shift || 500).to_i

strings = Array.new(1000) { SecureRandom.hex }
ary  = strings.map { |n| { :foo => n } }

count_sort_array_of_hashes     = 0
count_sort_by_array_of_hashes  = 0
count_sort_array_of_strings    = 0
count_sort_by_array_of_strings = 0

Benchmark.bmbm(40) do |x|
  x.report("#sort    array of hashes") do
    iterations.times do
      ary.sort {|a,b|
        count_sort_array_of_hashes +=1 
        a[:foo] <=> b[:foo]
      }
    end
  end

  x.report("#sort_by array of hashes") do
    iterations.times do 
      ary.sort_by { |a| 
        count_sort_by_array_of_hashes += 1
        a[:foo]
      }
    end
  end

  x.report("#sort    array of strings") do
    iterations.times do
      strings.sort { |a,b| 
        count_sort_array_of_strings +=1 
        a <=> b
      }
    end
  end

  x.report("#sort_by array of strings") do
    iterations.times do
      strings.sort_by { |a| 
        count_sort_by_array_of_strings += 1
        a
      }
    end
  end

  x.report("#sort direct array of strings") do
    iterations.times do
      strings.dup.sort
    end
  end

  x.report("#sort_by array of strings(2) (no counting)") do
    iterations.times do
      strings.dup.sort_by { |a| a }
    end
  end



end



puts
puts "Block invocations counts"
puts "========================"
puts
puts "#sort    array of hashes   : #{count_sort_array_of_hashes}"
puts "#sort_by array of hashes   : #{count_sort_by_array_of_hashes}"
puts "#sort    array of strings  : #{count_sort_array_of_strings}"
puts "#sort_by array of strings  : #{count_sort_by_array_of_strings}"