Benchmarking class creation vs hash

class-vs-hash-bench.rb

require 'benchmark/ips'

class FooBar
  attr_accessor :foo, :bar
  def initialize(foo:, bar:)
    self.foo = foo
    self.bar = bar
  end
end

Benchmark.ips do |b|
  b.report('creating a class') do
    foobar = FooBar.new(foo: 'foo', bar: 'bar')
  end

  b.report('creating a hash') do
    foobar = { foo: 'foo', bar: 'bar' }
  end

  b.compare!
end

# Warming up --------------------------------------
# creating a class    71.215k i/100ms
#  creating a hash   133.030k i/100ms
# Calculating -------------------------------------
# creating a class    836.255k (± 4.7%) i/s -      4.202M in   5.036732s
#  creating a hash      1.950M (± 4.3%) i/s -      9.844M in   5.057570s

# Comparison:
#  creating a hash:  1950208.3 i/s
# creating a class:   836255.1 i/s - 2.33x  slower