parenthesize.rb

require 'benchmark'

iterations = 1_000_000
bm_string = 'parenthesize this'

Benchmark.bmbm(7) do |x|
  x.report("gsub:") do
    iterations.times { bm_string.gsub(/^(.+)$/, '(\1)') }
  end

  x.report("gsub!:") do
    iterations.times { bm_string.dup.gsub!(/^(.+)$/, '(\1)') }
  end

  x.report("surround:") do
    iterations.times { '(' + bm_string + ')' }
  end

  x.report("interpolation:") do
    iterations.times { "(#{bm_string})" }
  end

  x.report("percent:") do
    iterations.times { '(%s)' % bm_string }
  end
end