benchmark_stringify.rb

require 'bundler/setup'
require 'active_support/all'
require 'benchmark/ips'
 
class Hash
  def new_transform_keys!
    return enum_for(:transform_keys!) unless block_given?
 
    keys.each do |key|
      if keys.map(&:to_s).count(key.to_s) == 1
        self[yield(key)] = delete(key)
      else
        delete(key)
      end
    end
 
    self
  end
 
  def new_stringify_keys!
    new_transform_keys!(&:to_s)
  end
end
 
Benchmark.ips do |x|
  x.time = 5
  x.warmup = 2
 
  x.report "stringify_keys!" do
    hsh = { surprise: true, 'surprise' => false }
    hsh.stringify_keys!
  end
 
  x.report "new_stringify_keys!" do
    hsh = { surprise: true, 'surprise' => false }
    hsh.new_stringify_keys!
  end
end