gistfile1.rb

require 'benchmark'

class User
  attr_accessor :a, :b, :c
  def attribute_names
    ["a","b","c"]
  end
  
end

u = User.new
u.a = "AAAAAA"
u.b = "BBBBBB"
u.c = "CCCCCC"
     
n = 10000000
Benchmark.bm do |x|
  x.report("A")  { 
    h = {}
    u.attribute_names.each { |a| h[a] = u.send(a) }
  }
  x.report("B") { 
    u.attribute_names.inject(Hash.new){ |h,j| h[j]= u.send(j); h }
  }
  x.report("C")  { 
    Hash[*u.attribute_names.map { |i| [i, u.send(i)] }.flatten]
  }
end