Benchmark (ips) comparison of value lookup.

compare_lookup.rb

require 'benchmark/ips'
require 'set'

numbers = (0..10_000_000).to_a
hash    = Hash[numbers.map { |n| [n, true] }]
set     = Set.new(numbers)

Benchmark.ips do |x|
  x.warmup = 5
  x.time   = 30

  x.report('array include?') do
    numbers.include?(10_000_000)
  end

  x.report('hash, key?') do
    hash.key?(10_000_000)
  end

  x.report('hash, dereference value') do
    hash[10_000_000]
  end

  x.report('set lookup') do
    set.include?(10_000_000)
  end
end