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                            ## 編程小知識

如果變量是一個布爾值，變量名最好加上 is、has 或 can 作為前綴（見下圖）。

![](http://cdn.aipin100.cn/de8b9136e8f948f3f9f6d06a48750ca2)

http://www.ruanyifeng.com/blog/2018/09/weekly-issue-24.html

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