TypeScript 有空条件运算符吗 [英] Does TypeScript have a Null-conditional operator

问题描述

有没有像 ?.在可以检查变量是否为空或未像 Kotlin 一样定义的 TypeScript 中?喜欢

Is there any operator like ?. in TypeScript that can check if the variable is null or not defined like Kotlin? Like

person?.getName()?.firstName ?: "None"

推荐答案

不，到目前为止，安全导航操作仍然没有在 Typescript 中实现:https://github.com/Microsoft/TypeScript/issues/16

No, as of now safe navigation operatior is still not implemented in Typescript: https://github.com/Microsoft/TypeScript/issues/16

然而，根据最新的标准化会议记录，它已经被提出，所以可能是 v3 :)

However according to the latest standardization meeting notes it has been proposed, so maybe v3 :)

https://github.com/tc39/agendas/blob/master/2017/07.md

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