blocks.rb

# BLOCKS
# def a_long_program
#   puts "doing a very long treatment..."
#   sleep 4
# end
# puts a_long_program

# def a_short_program
#   start = Time.now
#   puts "doing a very fast treatment..."
#   sleep 1
#   puts "work done !"
#   stop = Time.now
#   elapsed = "#{stop - start} s"
#   return elapsed
# end
# puts a_short_program

def timer
  start = Time.now
  # call any kind of code
  yield
  yield
  puts "work done !"
  stop = Time.now
  elapsed = "#{stop - start} s"
  return elapsed
end

puts (timer do
  puts "doing a very long treatment..."
  sleep 4
end)