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Create sleep timer in Ruby Programming

def timer
  start_time = Time.now
  yield
  puts "Elapsed time: #{Time.now - start_time}s"
end

timer() do
  puts "I'm doing something slow..."
  sleep(15)
  puts "I'm done :)"
end
# => I'm doing somethings slow...
# => I'm done :)
# => Elapsed time: 4s

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