gsub in heredoc benchmark

benchmark_gsub_heredoc.rb

def plain
  <<-ERR
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
    dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
    deserunt mollit anim id est laborum.
  ERR
end

def squigly
  <<~ERR
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
    dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
    deserunt mollit anim id est laborum.
  ERR
end

def gsubed
  <<-ERR.gsub(/^\s+/,'').gsub(/\n/, ' ')
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
    dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
    deserunt mollit anim id est laborum.
  ERR
end

def tr
  <<-ERR.gsub(/^\s+/,'').tr("\n", ' ')
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
    dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
    pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
    deserunt mollit anim id est laborum.
  ERR
end

require 'benchmark'

puts "Runing benchmark in Ruby #{RUBY_VERSION}"

plain
raise "squigly != gsubed\n\n#{squigly}\n\n#{gsubed}" if squigly != gsubed rescue nil
raise "gsubed != tr\n\n#{gsubed}\n\n#{tr}" if gsubed != tr

n = 100000
Benchmark.bm(10) do |x|
  x.report('plain')   { n.times do; plain; end }
  if (squigly rescue nil)
    x.report('squigly') { n.times do; squigly; end }
  else
    puts "squigly not supported in Ruby #{RUBY_VERSION}"
  end
  x.report('gsubed')  { n.times do; gsubed; end }
  x.report('tr')      { n.times do; tr; end }
end

results.sh

$ rvm 2.3.1 do ruby benchmark_gsub_heredoc.rb
Runing benchmark in Ruby 2.3.1
                 user     system      total        real
plain        0.010000   0.000000   0.010000 (  0.011866)
squigly      0.010000   0.000000   0.010000 (  0.010107)
gsubed       1.820000   0.030000   1.850000 (  1.867834)
tr           1.310000   0.020000   1.330000 (  1.352448)

# I then commented out the squigly method and ran with other ruby versions
$ rvm 2.2.3,2.1.8,1.9.3-p551 do ruby benchmark_gsub_heredoc.rb
Runing benchmark in Ruby 2.2.3
                 user     system      total        real
plain        0.020000   0.000000   0.020000 (  0.017694)
squigly not supported in Ruby 2.2.3
gsubed       2.630000   0.030000   2.660000 (  2.706699)
tr           2.220000   0.030000   2.250000 (  2.305155)

Runing benchmark in Ruby 2.1.8
                 user     system      total        real
plain        0.020000   0.000000   0.020000 (  0.019071)
squigly not supported in Ruby 2.1.8
gsubed       2.950000   0.040000   2.990000 (  3.074034)
tr           2.380000   0.030000   2.410000 (  2.476173)

Runing benchmark in Ruby 1.9.3
                 user     system      total        real
plain        0.020000   0.000000   0.020000 (  0.021079)
squigly not supported in Ruby 1.9.3
gsubed       1.170000   0.020000   1.190000 (  1.225133)
tr           0.960000   0.020000   0.980000 (  0.991184)