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require 'benchmark'

times = 200000

Benchmark.bm do |x|
  strings = []
  100.times do
    strings << "abcd"
  end

  numbers = []
  100.times do
    numbers << 123
  end

  x.report "dup strings" do
    i = 0
    while i < times
      strings.dup
      i += 1
    end
  end

  x.report "dup numbers" do
    i = 0
    while i < times
      numbers.dup
      i += 1
    end
  end
end

require 'benchmark'

times = 100000

Benchmark.bm do |x|
  strings = []
  100.times do
    strings << "abcd"
  end

  x.report do
    i = 0
    while i < times
      strings.sort
      i += 1
    end
  end
end

* before
- bm_ary_dup.rb
      user     system      total        real
dup strings  2.150000   0.070000   2.220000 (  1.854919)
dup numbers  0.460000   0.070000   0.530000 (  0.294771)

- bm_ary_sort.rb
      user     system      total        real
  2.130000   0.030000   2.160000 (  1.970458)


* after
- bm_ary_dup.rb
      user     system      total        real
dup strings  0.970000   0.090000   1.060000 (  0.585213)
dup numbers  0.500000   0.080000   0.580000 (  0.311979)

- bm_ary_sort.rb
      user     system      total        real
  1.330000   0.030000   1.360000 (  1.183701)