Symbol#to_proc vs blocks

proc_block.rb

require 'benchmark/ips'

[10, 100, 1000, 10_000].each do |size|
  range = (1..size)

  puts "\nUsing Array#map size #{size}:"
  Benchmark.ips do |x|
    x.report('Block         ') { range.map { |i| i.to_s } }
    x.report('Symbol#to_proc') { range.map(&:to_s) }
    x.compare!
  end

  puts "Using Array#each size #{size}:"
  Benchmark.ips do |x|
    x.report('Block         ') { range.each { |i| i.to_s } }
    x.report('Symbol#to_proc') { range.each(&:to_s) }
    x.compare!
  end
end

proc_block_summary.text

ruby 1.9.3p547 (2014-05-14) [x86_64-darwin14.0.0]
Using Array#map size 10:
  Comparison:
        Block         :   225844.6 i/s
        Symbol#to_proc:   224433.3 i/s - 1.01x slower

Using Array#each size 10:
  Comparison:
        Symbol#to_proc:   359495.0 i/s
        Block         :   317313.7 i/s - 1.13x slower


Using Array#map size 100:
  Comparison:
        Symbol#to_proc:    28015.5 i/s
        Block         :    26334.1 i/s - 1.06x slower

Using Array#each size 100:
  Comparison:
        Symbol#to_proc:    38636.7 i/s
        Block         :    32242.8 i/s - 1.20x slower


Using Array#map size 1000:
  Comparison:
        Symbol#to_proc:     3720.9 i/s
        Block         :     3388.1 i/s - 1.10x slower

Using Array#each size 1000:
  Comparison:
        Symbol#to_proc:     5116.9 i/s
        Block         :     4087.2 i/s - 1.25x slower


Using Array#map size 10000:
  Comparison:
        Symbol#to_proc:      359.8 i/s
        Block         :      258.5 i/s - 1.39x slower

Using Array#each size 10000:
  Comparison:
        Symbol#to_proc:      470.1 i/s
        Block         :      388.6 i/s - 1.21x slower


ruby 2.0.0p576 (2014-09-19) [x86_64-darwin14.0.0]
Using Array#map size 10:
  Comparison:
        Block         :   234459.4 i/s
        Symbol#to_proc:   232139.1 i/s - 1.01x slower

Using Array#each size 10:
  Comparison:
        Symbol#to_proc:   365396.5 i/s
        Block         :   341559.2 i/s - 1.07x slower


Using Array#map size 100:
  Comparison:
        Symbol#to_proc:    28839.2 i/s
        Block         :    27606.0 i/s - 1.04x slower

Using Array#each size 100:
  Comparison:
        Symbol#to_proc:    40908.2 i/s
        Block         :    36646.3 i/s - 1.12x slower


Using Array#map size 1000:
  Comparison:
        Symbol#to_proc:     2446.4 i/s
        Block         :     2149.2 i/s - 1.14x slower

Using Array#each size 1000:
  Comparison:
        Symbol#to_proc:     3747.5 i/s
        Block         :     3030.8 i/s - 1.24x slower


Using Array#map size 10000:
  Comparison:
        Symbol#to_proc:      356.3 i/s
        Block         :      336.7 i/s - 1.06x slower

Using Array#each size 10000:
  Comparison:
        Symbol#to_proc:      485.6 i/s
        Block         :      414.0 i/s - 1.17x slower


ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin14.0]
Using Array#map size 10:
  Comparison:
        Symbol#to_proc:   232131.3 i/s
        Block         :   226938.7 i/s - 1.02x slower

Using Array#each size 10:
  Comparison:
        Symbol#to_proc:   406072.3 i/s
        Block         :   382604.5 i/s - 1.06x slower


Using Array#map size 100:
  Comparison:
        Symbol#to_proc:    36333.6 i/s
        Block         :    31873.8 i/s - 1.14x slower

Using Array#each size 100:
  Comparison:
        Symbol#to_proc:    52197.2 i/s
        Block         :    43321.5 i/s - 1.20x slower


Using Array#map size 1000:
  Comparison:
        Symbol#to_proc:     3119.2 i/s
        Block         :     2896.9 i/s - 1.08x slower

Using Array#each size 1000:
  Comparison:
        Symbol#to_proc:     4161.0 i/s
        Block         :     3942.1 i/s - 1.06x slower


Using Array#map size 10000:
  Comparison:
        Symbol#to_proc:      311.5 i/s
        Block         :      199.0 i/s - 1.57x slower

Using Array#each size 10000:
  Comparison:
        Symbol#to_proc:      507.8 i/s
        Block         :      426.2 i/s - 1.19x slower


ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Using Array#map size 10:
  Comparison:
        Block         :   275271.0 i/s
        Symbol#to_proc:   261591.5 i/s - 1.05x slower

Using Array#each size 10:
  Comparison:
        Symbol#to_proc:   512647.5 i/s
        Block         :   470755.8 i/s - 1.09x slower


Using Array#map size 100:
  Comparison:
        Symbol#to_proc:    37350.5 i/s
        Block         :    36772.7 i/s - 1.02x slower

Using Array#each size 100:
  Comparison:
        Symbol#to_proc:    58635.6 i/s
        Block         :    50240.9 i/s - 1.17x slower


Using Array#map size 1000:
  Comparison:
        Block         :     3715.4 i/s
        Symbol#to_proc:     3677.0 i/s - 1.01x slower

Using Array#each size 1000:
  Comparison:
        Symbol#to_proc:     5587.5 i/s
        Block         :     4597.9 i/s - 1.22x slower


Using Array#map size 10000:
  Comparison:
        Symbol#to_proc:      355.2 i/s
        Block         :      339.1 i/s - 1.05x slower

Using Array#each size 10000:
  Comparison:
        Symbol#to_proc:      518.2 i/s
        Block         :      444.1 i/s - 1.17x slower


ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Using Array#map size 10:
  Comparison:
        Symbol#to_proc:   298189.1 i/s
        Block         :   295415.7 i/s - 1.01x slower

Using Array#each size 10:
  Comparison:
        Symbol#to_proc:   517869.4 i/s
        Block         :   449633.0 i/s - 1.15x slower


Using Array#map size 100:
  Comparison:
        Symbol#to_proc:    33502.5 i/s
        Block         :    31585.9 i/s - 1.06x slower

Using Array#each size 100:
  Comparison:
        Symbol#to_proc:    54738.3 i/s
        Block         :    44457.9 i/s - 1.23x slower


Using Array#map size 1000:
  Comparison:
        Symbol#to_proc:     3431.9 i/s
        Block         :     3190.7 i/s - 1.08x slower

Using Array#each size 1000:
  Comparison:
        Symbol#to_proc:     5590.9 i/s
        Block         :     4660.6 i/s - 1.20x slower


Using Array#map size 10000:
  Comparison:
        Symbol#to_proc:      353.3 i/s
        Block         :      344.5 i/s - 1.03x slower

Using Array#each size 10000:
  Comparison:
        Symbol#to_proc:      526.5 i/s
        Block         :      437.1 i/s - 1.20x slower