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[Rails] Benchmark to test ruby code performance

當兩個相近的方法，該選擇哪一種效能比較好？
一般開發者在網路上查到結果就照著使用，沒有特別理解佐證的過程
所以來分享佐證的好工具：
benchmark - 為 Ruby Standard Library

Benchmark.measure

計算單獨的 ruby single block

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def create_object(n)
  n.times do
    Object.new
  end
end
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require 'benchmark'

puts Benchmark.measure { create_object(10_000_000) }

output:

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    user     system      total        real
1.270000   0.010000   1.280000 (  1.272028)
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PostgreSQL apache2 api array async auto aws beautify-ruby benchmark bloomfilter bot branch bucket bug build build_stubbed centos chrome class collection command commit compass cookie count css databases db domain enum error es5 es6 eth exists extend factorybot factorygirl feeling figaro fixed font-size git godaddy hangzhou heroku hexo index install instance ios javascript jquery json lazy-loading learn lendbot lending length linode linux load-more logdown mariadb material-design meetup member migration modal mysql mysql@5.7 notify package-install pakogi performance poloniex pq preventDefault problm psql rails rake redis remote resource rollback routes rspec rss ruby ruby-on-rails s3 sass sass-convert screen scroll scss seo session setting share shell-script size spec speed stash stopPropagation string sublime symbol telegram test ubuntu url utf utf8mb4 version visual-studio wallet wget wordpress wpf xml youtube

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