From: Gavin <thinkersplayground@...>
Date: 2010-02-16T01:25:07+09:00
Subject: Parallel assignments vs. Serial assigments

Hey all

I was always under the impression that parallel assignments in Ruby
were faster than assigning variables individually.

Recently I was curious to see how much faster it was and decided to
test it:

class One

  def initialize(first_name, last_name)
    @first_name = first_name
    @last_name  = last_name
  end

end

class Two

  def initialize(first_name, last_name)
    @first_name, @last_name = first_name, last_name
  end

end
require "rubygems"
require "benchmark"

Benchmark.bmbm do |test|
  test.report("serial") do
    10000.times { |n| var =  One.new("gavin#{n}", "morrice")}
  end
  test.report("parallel") do
    10000.times { |n| var =  Two.new("gavin#{n}", "morrice")}
  end
end

The results I get show that it's slower (in both Ruby 1.8.7 and Ruby
1.9.1)

Can anyone elaborate?

Thanks