文字列の Range における include? と cover? のパフォーマンス比較

benchmark_include_and_cover_on_range_of_string.rb

# coding: utf-8
require 'benchmark'

range = 1.chr("UTF-8")..5000.chr("UTF-8")
try_count = 10000

Benchmark.bm(8) do |bm|
  bm.report('include?') do
    try_count.times do
      range.include?(rand(10000).chr("UTF-8"))
    end
  end
  bm.report('member?') do
    try_count.times do
      range.member?(rand(10000).chr("UTF-8"))
    end
  end
  bm.report('===') do
    try_count.times do
      range === rand(10000).chr("UTF-8")
    end
  end
  bm.report('cover?') do
    try_count.times do
      range.cover?(rand(10000).chr("UTF-8"))
    end
  end
end

#                user     system      total        real
# include?   4.100000   0.010000   4.110000 (  4.132348)
# member?    4.070000   0.010000   4.080000 (  4.098094)
# ===        3.930000   0.000000   3.930000 (  3.949908)
# cover?     0.010000   0.000000   0.010000 (  0.007477)