Simple Ruby stopwatch

stopwatch.rb

class Stopwatch
 
  def initialize()
    @start = Time.now
  end
   
  def elapsed_time
    now = Time.now
    elapsed = now - @start
    puts 'Started: ' + @start.to_s
    puts 'Now: ' + now.to_s
    puts 'Elapsed time: ' +  elapsed.to_s + ' seconds'
    elapsed.to_s
  end
   
end

## Usage

s = Stopwatch.new
sleep(2)
puts s.elapsed_time

## Output
# Started: Tue Sep 03 11:44:48 +0100 2013
# Now: Tue Sep 03 11:44:50 +0100 2013
# Elapsed time: 2.000997 seconds
# 2.000997

Thank you so much!

It's very good, however I think you should use Process.clock_gettime(Process::CLOCK_MONOTONIC) instead of Time.now as explaines in:
https://blog.dnsimple.com/2018/03/elapsed-time-with-ruby-the-right-way/

I've forked a version using it if you're interested: https://gist.github.com/x4d3/d41e8050caf0f7afbf10e618f64e7a22

Thank you, love it. I'm a beginner to ruby, I do not understand the line 22 sleep(2).

I had to stare at this for, like, 20 minutes before it made sense to me.
The 'sleep(2) really messed with me.

If I understand correctly:
right after 's = Stopwatch.new'
'def initialize()' comes into play where
'@start' is assigned whatever the current time is, via 'Time.now'
'@start' holds that value while,
'sleep(2) elapses 2 seconds, then
'elapsed_time' is called
From there, it's just subtracting the original time stored in @start,
from whatever the current time is, derived from 'now = Time.now'