Ticket #10717: benchmark_sym.rb

class Hash

  def symbolize_keys
    inject({}) do |options, (key, value)|
      options[(key.to_sym rescue key) || key] = value
      options
    end
  end

  # Destructively convert all keys to symbols.
  def symbolize_keys_old!
    self.replace(self.symbolize_keys)
  end

  def symbolize_keys!
    keys.each do |key|
      sym_key = (key.to_sym rescue key) || key
      self[sym_key] = delete(key) unless key == sym_key
    end
    self
  end
end


require 'benchmark'

hash = {}
'a'.upto('z') { |letter| hash[letter] = 1}

Benchmark.bmbm do |x|
  x.report('existing symbolize_keys!') { 10000.times { hash.dup.symbolize_keys_old! } }
  x.report('new symbolize_keys!') { 10000.times { hash.dup.symbolize_keys! } }
end