String#include? ってそんなに遅いものかね？ https://techracho.bpsinc.jp/hachi8833/2019_10_18/82048

00_version.txt

$ ruby -v
ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-darwin19]

10_original.rb

# frozen_string_literal: true

require 'benchmark/ips'

SLUG = 'test_some_kind_of_long_file_name.rb'

def slower
  SLUG =~ /^test_/
end

def slow
  SLUG.match?(/^test_/)
end

def fast_start
  SLUG.start_with?('test_')
end

def fast_end
  SLUG.end_with?('rb')
end

def fast_include
  SLUG.include?('_long_')
end

Benchmark.ips do |x|
  x.report('String#=~')          { slower }
  x.report('String#match?')      { slow } if RUBY_VERSION >= '2.4.0'
  x.report('String#start_with?') { fast_start }
  x.report('String#end_with?')   { fast_end }
  x.report('String#include?')    { fast_include }
  x.compare!
end

11_original.txt

Warming up --------------------------------------
           String#=~   132.956k i/100ms
       String#match?   782.020k i/100ms
  String#start_with?     1.268M i/100ms
    String#end_with?     1.243M i/100ms
     String#include?   891.121k i/100ms
Calculating -------------------------------------
           String#=~      1.288M (± 5.3%) i/s -      6.515M in   5.073370s
       String#match?      7.835M (± 1.0%) i/s -     39.883M in   5.090763s
  String#start_with?     12.618M (± 1.0%) i/s -     63.403M in   5.025501s
    String#end_with?     12.427M (± 0.4%) i/s -     62.136M in   5.000110s
     String#include?      8.865M (± 0.4%) i/s -     44.556M in   5.026249s

Comparison:
  String#start_with?: 12617714.5 i/s
    String#end_with?: 12427123.9 i/s - 1.02x  (± 0.00) slower
     String#include?:  8864800.7 i/s - 1.42x  (± 0.00) slower
       String#match?:  7835167.0 i/s - 1.61x  (± 0.00) slower
           String#=~:  1288148.5 i/s - 9.80x  (± 0.00) slower

20_my.rb

# frozen_string_literal: true

require 'benchmark/ips'

SLUG = 'test_some_kind_of_long_file_name.rb'

def slower
  SLUG =~ /^test_/
end

def slow
  SLUG.match?(/^test_/)
end

def fast_start
  SLUG.start_with?('test_')
end

def fast_end
  SLUG.end_with?('rb')
end

def fast_include
  SLUG.include?('test_')
end

Benchmark.ips do |x|
  x.report('String#=~')          { slower }
  x.report('String#match?')      { slow } if RUBY_VERSION >= '2.4.0'
  x.report('String#start_with?') { fast_start }
  x.report('String#end_with?')   { fast_end }
  x.report('String#include?')    { fast_include }
  x.compare!
end

21_my.txt

Warming up --------------------------------------
           String#=~   131.442k i/100ms
       String#match?   776.953k i/100ms
  String#start_with?     1.247M i/100ms
    String#end_with?     1.278M i/100ms
     String#include?     1.039M i/100ms
Calculating -------------------------------------
           String#=~      1.325M (± 1.1%) i/s -      6.704M in   5.059214s
       String#match?      7.836M (± 1.0%) i/s -     39.625M in   5.056976s
  String#start_with?     12.467M (± 0.5%) i/s -     62.370M in   5.003090s
    String#end_with?     12.734M (± 0.4%) i/s -     63.882M in   5.016861s
     String#include?     10.335M (± 0.4%) i/s -     51.972M in   5.028914s

Comparison:
    String#end_with?: 12733562.7 i/s
  String#start_with?: 12466708.5 i/s - 1.02x  (± 0.00) slower
     String#include?: 10334859.3 i/s - 1.23x  (± 0.00) slower
       String#match?:  7836438.7 i/s - 1.62x  (± 0.00) slower
           String#=~:  1325177.7 i/s - 9.61x  (± 0.00) slower

30_version.txt

$ ruby -v
ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x86_64-darwin19]

31_original.txt

Warming up --------------------------------------
           String#=~   127.098k i/100ms
       String#match?   710.754k i/100ms
  String#start_with?     1.092M i/100ms
    String#end_with?     1.048M i/100ms
     String#include?   771.099k i/100ms
Calculating -------------------------------------
           String#=~      1.273M (± 1.7%) i/s -      6.482M in   5.091987s
       String#match?      7.102M (± 6.4%) i/s -     35.538M in   5.029916s
  String#start_with?     10.944M (± 1.8%) i/s -     55.693M in   5.090621s
    String#end_with?     10.445M (± 2.5%) i/s -     52.418M in   5.022161s
     String#include?      7.654M (± 3.8%) i/s -     38.555M in   5.046023s

Comparison:
  String#start_with?: 10944206.6 i/s
    String#end_with?: 10445451.4 i/s - 1.05x  (± 0.00) slower
     String#include?:  7653534.3 i/s - 1.43x  (± 0.00) slower
       String#match?:  7101813.0 i/s - 1.54x  (± 0.00) slower
           String#=~:  1273404.5 i/s - 8.59x  (± 0.00) slower

32_my.txt

Warming up --------------------------------------
           String#=~   128.314k i/100ms
       String#match?   678.231k i/100ms
  String#start_with?     1.083M i/100ms
    String#end_with?     1.080M i/100ms
     String#include?   929.259k i/100ms
Calculating -------------------------------------
           String#=~      1.276M (± 2.9%) i/s -      6.416M in   5.034819s
       String#match?      7.267M (± 3.2%) i/s -     36.624M in   5.045871s
  String#start_with?     10.802M (± 0.6%) i/s -     54.156M in   5.013875s
    String#end_with?     10.799M (± 0.4%) i/s -     55.063M in   5.099252s
     String#include?      9.254M (± 1.9%) i/s -     46.463M in   5.022914s

Comparison:
  String#start_with?: 10801652.3 i/s
    String#end_with?: 10798549.8 i/s - same-ish: difference falls within error
     String#include?:  9253799.1 i/s - 1.17x  (± 0.00) slower
       String#match?:  7266531.5 i/s - 1.49x  (± 0.00) slower
           String#=~:  1275569.6 i/s - 8.47x  (± 0.00) slower