RougeRRR

benchmark.rb

require 'benchmark/ips'
require 'set'

Benchmark.ips do |x|
  empty = []
  exact = %w[foo]
  match = %w[foo bar]
  short = %w[bar baz]

  exact_set = Set['foo']

  x.report('Set empty') { empty.to_set > exact_set }
  x.report('Set exact') { exact.to_set > exact_set }
  x.report('Set match') { match.to_set > exact_set }
  x.report('Set short') { short.to_set > exact_set }

  x.report('Reg empty') { empty.size > 1 && empty.include?('foo') }
  x.report('Reg exact') { exact.size > 1 && exact.include?('foo') }
  x.report('Reg match') { match.size > 1 && match.include?('foo') }
  x.report('Reg short') { short.size > 1 && short.include?('foo') }

  x.compare!
end

output

Warming up --------------------------------------
           Set empty    60.556k i/100ms
           Set exact    49.552k i/100ms
           Set match    44.953k i/100ms
           Set short    43.193k i/100ms
           Reg empty   347.789k i/100ms
           Reg exact   342.195k i/100ms
           Reg match   259.546k i/100ms
           Reg short   250.949k i/100ms
Calculating -------------------------------------
           Set empty    775.286k (± 4.9%) i/s -      3.876M in   5.011502s
           Set exact    621.709k (± 3.7%) i/s -      3.122M in   5.028296s
           Set match    508.784k (± 4.4%) i/s -      2.562M in   5.045856s
           Set short    505.296k (± 3.5%) i/s -      2.548M in   5.049707s
           Reg empty     15.720M (± 3.1%) i/s -     78.600M in   5.005120s
           Reg exact     15.796M (± 4.2%) i/s -     79.047M in   5.013349s
           Reg match      7.510M (± 5.0%) i/s -     37.634M in   5.024517s
           Reg short      6.638M (± 3.5%) i/s -     33.376M in   5.034252s

Comparison:
           Reg exact: 15796054.6 i/s
           Reg empty: 15719866.3 i/s - same-ish: difference falls within error
           Reg match:  7509807.0 i/s - 2.10x  slower
           Reg short:  6638315.4 i/s - 2.38x  slower
           Set empty:   775285.6 i/s - 20.37x  slower
           Set exact:   621709.0 i/s - 25.41x  slower
           Set match:   508784.1 i/s - 31.05x  slower
           Set short:   505296.2 i/s - 31.26x  slower