gistfile1.rb

require 'benchmark'

def one
  yield 1
end

def a
  one { |x| yield x }
end

def b(&block)
  one(&block)
end

def c
  one(&Proc.new)
end

n = 1_000_000
Benchmark.bmbm do |x|
  x.report("&block") do
    n.times { b { |x| x } }
  end
  x.report("yield") do
    n.times { a { |x| x } }
  end
  x.report("&Proc.new") do
    n.times { c { |x| x } }
  end
end

# Rehearsal ---------------------------------------------
# &block      1.010000   0.020000   1.030000 (  1.034047)
# yield       0.190000   0.000000   0.190000 (  0.190613)
# &Proc.new   1.110000   0.010000   1.120000 (  1.123012)
# ------------------------------------ total: 2.340000sec