output.txt

Fixnum
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.027810)
true
  0.010000   0.000000   0.010000 (  0.006959)
--------------------------------------------------
String
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.027461)
true
  0.000000   0.000000   0.000000 (  0.007344)
--------------------------------------------------
Array
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.027043)
true
  0.010000   0.000000   0.010000 (  0.007165)
--------------------------------------------------
Hash
      user     system      total        real
true
  0.020000   0.000000   0.020000 (  0.026982)
true
  0.010000   0.000000   0.010000 (  0.007160)
--------------------------------------------------
Range
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.026966)
true
  0.010000   0.000000   0.010000 (  0.007119)
--------------------------------------------------
Symbol
      user     system      total        real
true
  0.020000   0.000000   0.020000 (  0.027621)
true
  0.010000   0.000000   0.010000 (  0.006903)
--------------------------------------------------
Regexp
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.026712)
true
  0.000000   0.000000   0.000000 (  0.007167)
--------------------------------------------------
Class
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.027748)
true
  0.010000   0.000000   0.010000 (  0.007405)
--------------------------------------------------
Object
      user     system      total        real
true
  0.030000   0.000000   0.030000 (  0.027256)
true
  0.000000   0.000000   0.000000 (  0.006655)
--------------------------------------------------

test.rb

require 'benchmark'

x = [
  123,
  'abc',
  [9, 'z'],
  { :y => 8 },
  1..100,
  :sym,
  /\Atest(?:|ing)\z/,
  Object,
  Object.new
]

x.each do |i|
  puts i.class
  a = b = nil

  Benchmark.bm do |bm|
    bm.report do
      100_000.times do
        a, b = [i] * 2
      end
      puts a.object_id == b.object_id
    end

    bm.report do
      100_000.times do
        a = b = i
      end
      puts a.object_id == b.object_id
    end
  end

  puts '-' * 50
end