myronmarston · October 3, 2010 04:03
diff --git a/results b/results
 $ ruby start_with_benchmark.rb
                      user     system      total        real
 start_with? fail  0.520000   0.000000   0.520000 (  0.519693)
 =~ fail           0.220000   0.000000   0.220000 (  0.220458)
 start_with? pass  0.880000   0.000000   0.880000 (  0.887475)
 =~ pass           0.610000   0.000000   0.610000 (  0.608715)
diff --git a/start_with_benchmark.rb b/start_with_benchmark.rb

 require 'benchmark'

 times = 1000000
 string = "this is a string"

 Benchmark.bm(16) do |x|
  x.report("start_with? fail") do
    times.times do
      string.start_with?("thit")
    end
  end

  x.report("=~ fail") do
    times.times do
      string =~ /^thit/
    end
  end

  x.report("start_with? pass") do
    times.times do
      string.start_with?("this")
    end
  end

  x.report("=~ pass") do
    times.times do
      string =~ /^this/
    end
  end
 end