block-less.rb

require "benchmark/ips"

Benchmark.ips do |r|
  r.report("block argument, not yielded") do
    m = Module.new do
      def foo(&block)
      end

      module_function :foo
    end

    m.foo do
    end
  end

  r.report("no argument, not yielded") do
    m = Module.new do
      def foo
      end

      module_function :foo
    end

    m.foo do
    end
  end

  r.report("block argument, yielded") do
    m = Module.new do
      def foo(&block)
        block.call
      end

      module_function :foo
    end

    m.foo do
    end
  end

  r.report("no argument, yielded") do
    m = Module.new do
      def foo
        yield
      end

      module_function :foo
    end

    m.foo do
    end
  end

  r.report("block argument, no block given") do
    m = Module.new do
      def foo(&block)
      end

      module_function :foo
    end

    m.foo
  end

  r.report("no argument, no block given") do
    m = Module.new do
      def foo
      end

      module_function :foo
    end

    m.foo
  end
end

__END__
Warming up --------------------------------------
block argument, not yielded     40.191k i/100ms
no argument, not yielded        41.194k i/100ms
block argument, yielded         35.276k i/100ms
no argument, yielded            41.049k i/100ms
block argument, no block given  41.113k i/100ms
no argument, no block given     41.267k i/100ms
Calculating -------------------------------------
block argument, not yielded     448.670k (± 1.8%) i/s -      2.251M in   5.018106s
no argument, not yielded        438.739k (± 7.3%) i/s -      2.183M in   5.007818s
block argument, yielded         367.827k (± 5.4%) i/s -      1.834M in   5.003140s
no argument, yielded            445.064k (± 2.1%) i/s -      2.258M in   5.074977s
block argument, no block given  446.703k (± 3.2%) i/s -      2.261M in   5.067838s
no argument, no block given     448.327k (± 2.9%) i/s -      2.270M in   5.067136s