Structs vs classes

structs_test.rb

# SORBET_RUNTIME_DEFAULT_CHECKED_LEVEL=never RUBY_YJIT_ENABLE=1  ruby structs_test.rb
# SORBET_RUNTIME_DEFAULT_CHECKED_LEVEL=never ruby structs_test.rb
# SORBET_RUNTIME_DEFAULT_CHECKED_LEVEL=always ruby structs_test.rb

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "sorbet", "~> 0.5.11002"
  gem "benchmark-ips"
  gem "sorbet-runtime", "~> 0.5.11002"
end

require 'sorbet-runtime'

class Entity < T::Struct
   const :id, Integer
   const :kind, String
end

Entity2 = Struct.new(:id, :kind)

Entity3 = Data.define(:id, :kind)

class Entity4
  extend T::Sig

  sig { returns(Integer) }
  attr_reader :id
  sig { returns(String) }
  attr_reader :kind

  sig { params(id: Integer, kind: String).void }
  def initialize(id, kind)
    @id = id
    @kind = kind
  end
end

Benchmark.ips do |x|
  x.report("T::Struct") do
    Entity.new(id: 1, kind: "shop")
  end

  x.report("Struct") do
    Entity2.new(1, "test")
  end

  x.report("Data") do
    Entity3.new(1, "test")
  end

  x.report("Class") do
    Entity4.new(1, "test")
  end

  x.compare!
end