require 'benchmark'

n = 1_000_000

login = 'login'
time = Time.now.to_i

Benchmark.bmbm 20 do |results|
  results.report 'cycle' do
    n.times do
    end
  end

  # result: 3 array object usage
  results.report '[] + []' do
    n.times do
      [login, time] + [3, 4, 5]
    end
  end

  # result: 2 array object usage
  results.report '[].push(*[])' do
    n.times do
      [login, time].push(*[3, 4, 5])
    end
  end

  # result: 1 array object usage
  results.report '[].unshift(a, b)' do
    n.times do
      [3, 4, 5].unshift(login, time)
    end
  end
end