Benchmark: Array.include? vs. Hash.include?

gistfile1.rb

require 'benchmark'

array = (1..1_000_000).to_a
hash = Hash[array.map {|x| [x, nil]}]

Benchmark.bm(15) do |x|
    x.report("Array.include?") { 1000.times { array.include?(500_000) } }
    x.report("Hash.include?") { 1000.times { hash.include?(500_000) } }
end
#                      user     system      total        real
# Array.include?  46.190000   0.160000  46.350000 ( 46.593477)
# Hash.include?    0.000000   0.000000   0.000000 (  0.000523)