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if/unless 寫作不要用多重否定句啊

 2 years ago
source link: https://blog.niclin.tw/2018/11/26/if/unless-%E5%AF%AB%E4%BD%9C%E4%B8%8D%E8%A6%81%E7%94%A8%E5%A4%9A%E9%87%8D%E5%90%A6%E5%AE%9A%E5%8F%A5%E5%95%8A/
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Nic Lin's Blog

喜歡在地上滾的工程師

多重否定句真的很煩啊！

雖然 ruby 有 unless 可以用，就可以不用寫 if not

不過可以用 if ，就避免用 unless ，除非 unless 較符合原意。

unless content.blank?
  # ....
end

畢竟 unless not 還是比較難在第一時間讀懂的，舉一個比較極端的例子 XD

unless !content.present?
  # ....
end

尤其兩個條件以上或有 else 時更不建議用 unless。

if !foo?
  # ....
else
  # ....
end

unless foo? && baz?
  # ....
end

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