Anagram check benchmarks

anagram_benchmarks.rb

require 'benchmark'

string1 = 'старорежимность'
string2 = 'нерасторжимость'

N = 100000

Benchmark.bm(30) do | x |
  x.report('Sorted array equality') do
    N.times { string1.chars.sort == string2.chars.sort }
  end

  x.report('Chars count (inject)') do
    N.times { string1.chars.inject(Hash.new(0)){|h, c| h[c] += 1; h} == string2.chars.inject(Hash.new(0)){|h, c| h[c] += 1; h} }
  end

  x.report('Chars count (with_object)') do
    N.times { string1.chars.each_with_object({}) {|c,ob| ob[c] = string1.count(c) if ob[c].nil?} == string2.chars.each_with_object({}) {|c,ob| ob[c] = string2.count(c) if ob[c].nil?} }
  end
end

# Result:
#                                      user     system      total        real
# Sorted array equality            0.540000   0.000000   0.540000 (  0.544768)
# Chars count (inject)             1.270000   0.000000   1.270000 (  1.288586)
# Chars count (with_object)        3.700000   0.000000   3.700000 (  3.742738)