Testing various implementations of introspecting on a string

string_benchmark.rb

require 'benchmark'

module MyShortcuts
  def consonants
    self.gsub /[aeiuo0-9]/i, ''
  end

  def vowels
    self.gsub /[^aieou]/i, ''
  end

  def capitols
    self.gsub /[^A-Z]/, ''
  end

  def lowercase
    self.gsub /[^a-z]/, ''
  end

  def numbers
    self.gsub /[^0-9]/, ''
  end
end

class MyString < String
  include MyShortcuts
end

n = 1000000

def random_string
  available = ('a'..'z').to_a + ('A'..'Z').to_a + ('0'..'9').to_a
  20.times.inject('') {|m,v| m += available[rand(available.size)]}
end

Benchmark.bm do |x|
  x.report('singleton:     ') do
    n.times do
      s = random_string
      s.extend MyShortcuts
      s.consonants
      s.vowels
      s.capitols
      s.lowercase
      s.numbers
    end
  end
  x.report('regex:         ') do
    n.times do
      s = random_string
      s.gsub /[aeiou0-9]/i, ''
      s.gsub /[^aieou]/i, ''
      s.gsub /[^A-Z]/, ''
      s.gsub /[^a-z]/, ''
      s.gsub /[^0-9]/, ''
    end
  end
  x.report('regular class: ') do
    n.times do
      s = MyString.new random_string
      s.consonants
      s.vowels
      s.capitols
      s.lowercase
      s.numbers
    end
  end
end