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重构与模式系列（一）简化函数
source link: https://juejin.im/post/59dd722ef265da432b49c9fb
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函数多长合适？ Functions should do one thing每一个函数应该都只做一件事情，如果一个函数做了过多的事情，那么它极为不稳定，这种耦合性得到的是低内聚和脆弱的设计，且不方便维护与阅读。在人的常规思维中，总是习惯把一组相关的行为放到一起
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