bm__JSON.parse_HWIA_deep_symbolize_keys_symbolized_name

bm__JSON.parse_HWIA_deep_symbolize_keys_symbolized_name.rb

# frozen_string_literal: true

require 'benchmark/ips'
require 'benchmark/memory'
require 'active_support/all'

TIMES = 50_000

HASH = {
  "colour" => "red",
  "sizes" => [
    "measurements_1" => {
      "height" => 1,
      "length" => 2,
      "depth" => 3,
      "specs" => {
        "oval" => true,
        "patterns" => "french lily"
      }
    },
    "measurements_2" => {
      "height" => 10,
      "length" => 20,
      "depth" => 30,
    }
  ]
}.to_json

Benchmark.ips do |x|
  x.config(:time => 5, :warmup => 2)

  x.report("with_indifferent_access:") { JSON.parse(HASH).with_indifferent_access[:sizes][0][:measurements_1][:specs] }
  x.report("deep_symbolize_keys:") { JSON.parse(HASH).deep_symbolize_keys[:sizes][0][:measurements_1][:specs] }
  x.report("symbolize_names:") { JSON.parse(HASH, symbolize_names: true)[:sizes][0][:measurements_1][:specs] }

  x.compare!
end

# Warming up --------------------------------------
# with_indifferent_access:
#                          7.030k i/100ms
# deep_symbolize_keys:     7.100k i/100ms
#      symbolize_names:    17.229k i/100ms
# Calculating -------------------------------------
# with_indifferent_access:
#                          67.537k (± 5.2%) i/s -    337.440k in   5.010073s
# deep_symbolize_keys:     79.691k (± 3.6%) i/s -    404.700k in   5.085082s
#      symbolize_names:    166.636k (± 8.6%) i/s -    826.992k in   5.037052s

# Comparison:
#      symbolize_names::   166635.5 i/s
# deep_symbolize_keys::    79691.3 i/s - 2.09x  (± 0.00) slower
# with_indifferent_access::    67537.1 i/s - 2.47x  (± 0.00) slower

Benchmark.memory do |x|
  x.report("with_indifferent_access:") { JSON.parse(HASH).with_indifferent_access[:sizes][0][:measurements_1][:specs] }
  x.report("deep_symbolize_keys:") { JSON.parse(HASH).deep_symbolize_keys[:sizes][0][:measurements_1][:specs] }
  x.report("symbolize_names:") { JSON.parse(HASH, symbolize_names: true)[:sizes][0][:measurements_1][:specs] }

  x.compare!
end

# Calculating -------------------------------------
# with_indifferent_access:
#                          4.960k memsize (   504.000  retained)
#                         38.000  objects (     3.000  retained)
#                         12.000  strings (     1.000  retained)
# deep_symbolize_keys:     5.640k memsize (     1.280k retained)
#                         55.000  objects (     8.000  retained)
#                         12.000  strings (     2.000  retained)
#      symbolize_names:    4.152k memsize (     0.000  retained)
#                         37.000  objects (     0.000  retained)
#                         12.000  strings (     0.000  retained)

# Comparison:
#      symbolize_names::       4152 allocated
# with_indifferent_access::       4960 allocated - 1.19x more
# deep_symbolize_keys::       5640 allocated - 1.36x more

ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-darwin19]