Benchmark using ARGS constant for method arguments

keyword_arguments_bench.rb

require 'benchmark/ips'

Benchmark.ips do |benchmark|
  benchmark.config(time: 5, warmup: 2)


  benchmark.report("keyword-args") do
    def foo(a: nil, b: nil, c: nil, d: nil, e: nil)
      bar(a: a, b: b, c: c, d: d, e: e)
    end

    def bar(a: nil, b: nil, c: nil, d: nil, e: nil)
      e
    end

    foo(e: 1)
  end

  benchmark.report("opts-hash") do
    def foo(args={})
      bar(args)
    end

    def bar(args={})
      args[:e]
    end

    foo(e: 1)
  end

  ARGS = {}.freeze
  benchmark.report("opts-hash-constant") do
    def foo(args=ARGS)
      bar(args)
    end

    def bar(args=ARGS)
      args[:e]
    end

    foo(e: 1)
  end

  benchmark.report("opts-splat") do
    def foo(**args)
      bar(args)
    end

    def bar(args)
      args[:e]
    end

    foo(e: 1)
  end

  benchmark.report("caller-splat") do
    def foo(**args)
      bar(**args)
    end

    def bar(**args)
     args[:e]
    end

    foo(**{e: 1})
  end

  benchmark.compare!
end

### RESULTS ###
# Warming up --------------------------------------
#         keyword-args   109.985k i/100ms
#            opts-hash   108.705k i/100ms
#   opts-hash-constant   109.232k i/100ms
#           opts-splat    99.706k i/100ms
#         caller-splat    68.788k i/100ms
# Calculating -------------------------------------
#         keyword-args      1.040M (± 1.0%) i/s -      5.279M in   5.077242s
#            opts-hash      1.028M (± 2.0%) i/s -      5.218M in   5.077435s
#   opts-hash-constant    982.599k (± 8.4%) i/s -      4.915M in   5.043748s
#           opts-splat    934.116k (± 1.3%) i/s -      4.686M in   5.017618s
#         caller-splat    681.345k (± 1.1%) i/s -      3.439M in   5.048571s
# 
# Comparison:
#         keyword-args:  1039889.1 i/s
#            opts-hash:  1028102.1 i/s - same-ish: difference falls within error
#   opts-hash-constant:   982598.6 i/s - same-ish: difference falls within error
#           opts-splat:   934116.0 i/s - 1.11x  (± 0.00) slower
#         caller-splat:   681344.8 i/s - 1.53x  (± 0.00) slower