Simple #tap usage

bench.rb

require 'benchmark'


Benchmark.bmbm do |x|

  x.report 'direct call' do
    1_000_000.times do
      x = true
      x.nil?
      x
    end
  end

  x.report 'using tap Symbol#to_proc' do
    1_000_000.times do
      true.tap &:nil?
    end
  end

  x.report 'using tap block' do
    1_000_000.times do
      true.tap { |x| x.nil? }
    end
  end

end

cruby-output.txt

○ ruby bench.rb
Rehearsal ------------------------------------------------------------
direct call                0.140000   0.000000   0.140000 (  0.160083)
using tap Symbol#to_proc   0.330000   0.000000   0.330000 (  0.349109)
using tap block            0.260000   0.010000   0.270000 (  0.295242)
--------------------------------------------------- total: 0.740000sec

                               user     system      total        real
direct call                0.140000   0.000000   0.140000 (  0.156700)
using tap Symbol#to_proc   0.340000   0.000000   0.340000 (  0.364256)
using tap block            0.270000   0.000000   0.270000 (  0.295129)

macruby-output.txt

 ○ macruby bench.rb
Rehearsal ------------------------------------------------------------
direct call                0.100000   0.000000   0.100000 (  0.114795)
using tap Symbol#to_proc   3.460000   0.270000   3.730000 (  4.022874)
using tap block            0.400000   0.000000   0.400000 (  0.446039)
--------------------------------------------------- total: 4.230000sec

                               user     system      total        real
direct call                0.200000   0.030000   0.230000 (  0.196450)
using tap Symbol#to_proc   4.650000   0.310000   4.960000 (  4.815747)
using tap block            0.950000   0.040000   0.990000 (  0.865683)