Lookup comparison

comparison.rb

require 'benchmark/ips'
require 'set'

array = ('a'..'z').map(&:to_sym)
hash = Hash[array.map {|x| [x, 1]}]
set = Set.new(array)

Benchmark.ips do |x|
	x.report('array') { array.include?(:a) }
	x.report('hash') { hash.key?(:a) }
	x.report('set') { set.include?(:a) }
end

results.txt

Warming up --------------------------------------
               array   268.956k i/100ms
                hash   274.570k i/100ms
                 set   258.043k i/100ms
Calculating -------------------------------------
               array      8.310M (± 5.1%) i/s -     41.688M in   5.031376s
                hash      8.497M (± 5.7%) i/s -     42.558M in   5.027836s
                 set      7.785M (± 6.4%) i/s -     38.964M in   5.028996s