Hash vs Set lookup benchmark

hash_vs_set.rb

#!/usr/bin/env ruby
require 'set'
require 'benchmark/ips'

NON_PRINTABLE_CHARS_HASH = {
  0x0  => true,
  0x1  => true,
  0x2  => true,
  0x3  => true,
  0x4  => true,
  0x5  => true,
  0x6  => true,
  0x7  => true,
  0x8  => true,
  0x11 => true,
  0x12 => true,
  0x14 => true,
  0x15 => true,
  0x16 => true,
  0x17 => true,
  0x18 => true,
  0x19 => true,
  0x1a => true,
  0x1b => true,
  0x1c => true,
  0x1d => true,
  0x1e => true,
  0x1f => true,
  0x7f => true,
  0x80 => true,
  0x81 => true,
  0x82 => true,
  0x83 => true,
  0x84 => true,
  0x85 => true,
  0x86 => true,
  0x87 => true,
  0x88 => true,
  0x89 => true,
  0x8a => true,
  0x8b => true,
  0x8c => true,
  0x8d => true,
  0x8e => true,
  0x8f => true,
  0x90 => true,
  0x91 => true,
  0x92 => true,
  0x93 => true,
  0x94 => true,
  0x95 => true,
  0x96 => true,
  0x97 => true,
  0x98 => true,
  0x99 => true,
  0x9a => true,
  0x9b => true,
  0x9c => true,
  0x9d => true,
  0x9e => true,
  0x9f => true
}.freeze

NON_PRINTABLE_CHARS = Set.new([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x11,
  0x12, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
  0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b,
  0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
  0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f]).freeze

Benchmark.ips do |x|
  x.report('hash') { NON_PRINTABLE_CHARS_HASH[0x9f] }
  x.report('set')  { NON_PRINTABLE_CHARS.include?(0x9f) }
end

__END__
Calculating -------------------------------------
                hash   117.408k i/100ms
                 set    99.088k i/100ms
-------------------------------------------------
                hash      7.790M (± 7.5%) i/s -     38.745M # BEST
                 set      5.594M (± 6.8%) i/s -     27.844M

Ruby:

    ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin13]

Hardware:

    Hardware Overview:

      Model Name: MacBook Air
      Model Identifier: MacBookAir5,2
      Processor Name: Intel Core i7
      Processor Speed: 2 GHz
      Number of Processors: 1
      Total Number of Cores: 2
      L2 Cache (per Core): 256 KB
      L3 Cache: 4 MB
      Memory: 8 GB
      Boot ROM Version: MBA51.00EF.B02
      SMC Version (system): 2.5f9

Software:

    System Software Overview:

      System Version: OS X 10.9.5 (13F34)
      Kernel Version: Darwin 13.4.0
      Time since boot: 45 days 23:00