A simple benchmark of array v hash v set in Ruby

arrayhashset_benchmark.rb

require 'benchmark'
require 'set'

ranges = [ "a".."z", "A".."Z", 0..9 ]
n = ARGV[0].to_i || 100

Benchmark.bm do |x|
  #array
  x.report "array" do
    n.times do
      array = []
      ranges.each do |range|
        range.each do |r|
          array[r.to_i] = 0
        end
      end
    end
  end
  #hash
  x.report "hash" do
    n.times do
      hash = {}
      ranges.each do |range|
        range.each do |r|
          hash[r] = 0
        end
      end
    end
  end
  #set
  x.report "set" do
    n.times do
      set = Set.new
      ranges.each do |range|
        range.each do |r|
          set.add r.to_i
        end
      end
    end
  end
end