ruby laziness

lazy.rb

require 'benchmark/ips'

START = 1
FINISH = 1_000_000
HALF = FINISH / 2

Benchmark.ips do |x|
  x.report('lazy') do
    (START..FINISH).lazy.include?(HALF)
  end

  x.report('nolazy') do
    (START..FINISH).include?(HALF)
  end
end

# -*- mode: ruby-compilation; default-directory: "~/src/sandbox/" -*-
# RubyComp started at Mon Dec 15 14:54:22
# 
# ruby /home/jmdeldin/src/sandbox/lazy.rb
# Calculating -------------------------------------
#                 lazy     2.000  i/100ms
#               nolazy   110.953k i/100ms
# -------------------------------------------------
#                 lazy     48.681  (± 2.1%) i/s -    244.000 
#               nolazy      4.018M (± 4.8%) i/s -     20.082M
# 
# RubyComp finished at Mon Dec 15 14:54:36