Bob vs Bob

bob_bm.rb

require 'benchmark'

class Bob
  def hey(msg)
    case msg
    when nil, ""
      "Fine. Be that way!"
    when /\A[^a-z]+\z/
      "Woah, chill out!"
    when /\?\z/
      "Sure."
    else
      "Whatever."
    end
  end
end

class Bob2
  def hey(message)
    message = Message.new(message)
    if message.dumb?
      'Fine. Be that way!'
    elsif message.angry?
      'Woah, chill out!'
    elsif message.inquisitive?
      'Sure.'
    else
      "Whatever."
    end
  end
end

class Message
  def initialize(message)
    @content = message.to_s
  end

  def angry?
    @content.upcase == @content && !dumb?
  end

  def inquisitive?
    @content.end_with? "?"
  end

  def dumb?
    @content.lstrip.empty?
  end
end

Benchmark.bm do |x|
  bob = Bob.new
  msg = "Allo " + " allo" * 1000 + " allo?"
  x.report("my") { 100000.times { bob.hey(msg) } }
  bob2 = Bob2.new
  x.report("other") { 100000.times { bob2.hey(msg) } }
end