hash benchmark

hash_benchmark.rb

# -*- immutable: string -*-

require 'benchmark'

class Request
  def initialize(first, last, city, state, country)
    @hash =
    {
      'first'   => first,
      'last'    => last,
      'city'    => city,
      'state'   => state,
      'country' => country
    }
  end

  def first
    @hash['first']
  end

  def last
    @hash['last']
  end

  def city
    @hash['city']
  end

  def state
    @hash['state']
  end

  def country
    @hash['country']
  end

  def to_a
    [first, last, city, state, country]
  end
end

result = Benchmark.measure do
  request = Request.new('Colin', 'Kelley', 'Santa Barbara', 'CA', 'USA')

  10_000_000.times do
    request.to_a
  end
end

puts result

results

Without magic comment:  11.43 seconds
With magic comment:      6.98 seconds           # -*- immutable: string -*-

Immutable string version runs 1.64X faster (runs in just 61% of the time) compared to stock Ruby 2.1.0

Github pull request:
https://github.com/ruby/ruby/pull/487

Ruby issue:
https://bugs.ruby-lang.org/issues/9278