Testing timers using Benchmark vs start/end/ diffing

timer.rb

require 'benchmark'

def janky(length)
	start_time = Time.now
	(1..length).each { |num| num }
	time = Time.now - start_time
	time
end

def benchmarked(length)
	time = Benchmark.realtime do
		(1..length).each { |num| num }
	end
	time
end


puts "janky version time: #{janky(4000)}"

puts "benchmarked version time: #{benchmarked(4000)}"

These two methods apparently aren't the same.

ladowitzs-mbair:Desktop dladowitz$ ruby times.rb
janky version time: 0.000471
benchmarked version time: 0.000594