javascript中的obj..prop语法是什么？ [英] What is the obj?.prop syntax in javascript?

问题描述

我正在看一个代码，碰到了这个问题：

I was looking through a code and I came across this:

{{abc?.xvy=== tyu?abc?.xz:abc?.xz}}

我无法理解此表达式的含义。我知道这是Null安全的属性访问，但是我对链接有点困惑。
非常感谢任何帮助

I am unable to understand meaning of this expression. I know that it is Null-safe property access but I am bit confused about the chaining. Any help is much appreciated

推荐答案

其新的ES提案称为可选，用于安全检查对象属性。上面的表达式等于：

Its new ES proposal called "optionals" for safe check reading for object properties. Above expression is equivalent to:

(abc && abc.xvy) === (tyu) ? (abc && abc.xz) : (abc && abc.xz)

您可以在此处找到更多详细信息： https://github.com/davidyaha/ecmascript-optionals-proposal

You can find more details here: https://github.com/davidyaha/ecmascript-optionals-proposal

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