benchmark_named_block_arg.rb

require 'benchmark'

def with_greet(name)
  yield "hi, #{name}"
end

def with_greet_jack
  with_greet("jack") { |greet| yield greet }
end

def with_greet_jill(&block)
  with_greet("jill", &block)
end

N = 1_000_000

Benchmark.bmbm do |x|
  x.report("jack") do
    N.times { with_greet_jack { |greet| greet } }
  end
  x.report("jill") do
    N.times { with_greet_jill { |greet| greet } }
  end
end

# On 2.6 GHz Intel Core i7, 16 GB RAM
# Ruby MRI 2.1.0, Mac OS X 10.9.1
#
# Rehearsal ----------------------------------------
# jack   0.310000   0.000000   0.310000 (  0.307267)
# jill   0.810000   0.000000   0.810000 (  0.818499)
# ------------------------------- total: 1.120000sec
#  
#            user     system      total        real
# jack   0.300000   0.000000   0.300000 (  0.305173)
# jill   0.810000   0.000000   0.810000 (  0.810883)