capture_vs_no_capture.rb

require "benchmark"

def foo(&block)
  bar(&block)
end

def bar
  yield
end

def foo2
  bar2 do
    yield
  end
end

def bar2
  yield
end

def foo3(&block)
  bar3 do
    yield
  end
end

def bar3
  yield
end

Benchmark.bmbm(20) do |bm|
  bm.report("capture") do
    1_000_000.times do
      a = 0
      foo do
        a += 1
      end
    end
  end
  bm.report("non_capture") do
    1_000_000.times do
      a = 0
      foo2 do
        a += 1
      end
    end
  end
  bm.report("non_capture_with_name") do
    1_000_000.times do
      a = 0
      foo3 do
        a += 1
      end
    end
  end
end

output.txt

Rehearsal ---------------------------------------------------------
capture                 0.760000   0.010000   0.770000 (  0.762715)
non_capture             0.220000   0.000000   0.220000 (  0.223030)
non_capture_with_name   0.820000   0.000000   0.820000 (  0.829489)
------------------------------------------------ total: 1.810000sec

                            user     system      total        real
capture                 0.760000   0.010000   0.770000 (  0.767258)
non_capture             0.220000   0.000000   0.220000 (  0.220611)
non_capture_with_name   0.860000   0.000000   0.860000 (  0.875678)