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                不要使用尤達表達式。尤達表達式是指,拿一個常量去和變量比較而不是拿變量去和常量比較。它就像是在表達 “藍色是不是天空的顏色” 或者 “高個是不是這個男人的屬性” 而不是 “天空是不是藍的” 或者 “這個男人是不是高個子的” ![Yoda](https://box.kancloud.cn/2015-07-22_55af0bd8f40d4.png) (譯者注:名字起源于星球大戰中尤達大師的講話方式,總是用倒裝的語序) **推薦:** ~~~ if ([myValue isEqual:@42]) { ... ~~~ **不推薦:** ~~~ if ([@42 isEqual:myValue]) { ... ~~~
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