implicit blocks with yield are 5x faster than explicit blocks

implicit-vs-explicit blocks

require 'benchmark'

n = 100_000

Benchmark.bmbm do |test|
  test.report 'implicit block with yield' do
    def test
      yield if block_given?
    end
    n.times do test {} end
  end

  test.report 'explicit block with yield' do
    def test &block
      yield if block
    end
    n.times do test {} end
  end

  test.report 'implicit block with Proc.new.call' do
    def test
      Proc.new.call if block_given?
    end
    n.times do test {} end
  end
end

## Ruby 1.8
# Rehearsal ---------------------------------------------------------------------
# implicit block with yield           0.050000   0.000000   0.050000 (  0.071948)
# explicit block with yield           0.250000   0.020000   0.270000 (  0.314715)
# implicit block with Proc.new.call   0.310000   0.020000   0.330000 (  0.381164)
# ------------------------------------------------------------ total: 0.650000sec

#                                         user     system      total        real
# implicit block with yield           0.050000   0.000000   0.050000 (  0.070865)
# explicit block with yield           0.250000   0.020000   0.270000 (  0.325773)
# implicit block with Proc.new.call   0.310000   0.020000   0.330000 (  0.516835)

## Ruby 1.9
# Rehearsal ---------------------------------------------------------------------
# implicit block with yield           0.030000   0.000000   0.030000 (  0.036943)
# explicit block with yield           0.100000   0.020000   0.120000 (  0.137407)
# implicit block with Proc.new.call   0.130000   0.010000   0.140000 (  0.149215)
# ------------------------------------------------------------ total: 0.290000sec

#                                         user     system      total        real
# implicit block with yield           0.020000   0.000000   0.020000 (  0.028637)
# explicit block with yield           0.110000   0.010000   0.120000 (  0.137352)
# implicit block with Proc.new.call   0.130000   0.010000   0.140000 (  0.163363)