optional_block_test.rb

require 'benchmark' # standard library module

def once_yield
  if block_given?
    yield
  end
end

def once_block(&block)
  if block
    block.call
  end
end

def once_yieldblock(&block)
  if block
    yield
  end
end

n = 10000000

Benchmark.bm do |x|
  x.report('yield:             ') { n.times do; once_yield {1+1}; end }
  x.report('block              ') { n.times do; once_block {1+1}; end }
  x.report('yieldblock         ') { n.times do; once_yieldblock {1+1}; end }

  x.report('yield no block:    ') { n.times do; once_yield; end }
  x.report('block no block     ') { n.times do; once_block; end }
  x.report('yieldblock no block') { n.times do; once_yieldblock; end }
end