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“鸣蛇”再添新功能：空值合并
source link: https://www.v2ex.com/t/800871
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“鸣蛇”再添新功能：空值合并 - V2EX
https://github.com/abersheeran/mingshe
写过 JavaScript 的人应该很熟悉的 ?? 运算符。a ?? b 等价于 a if a is not None else b。
预计还会增加 JavaScript 里的 ?. 操作符，但还在考量之中。欢迎大家使用、提意见。
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