ES6/2015 中的空安全屬性訪問（和條件賦值） - Null-safe property access (and conditional assignment) in ES6/2015

問題：

Is there a null -safe property access (null propagation / existence) operator in ES6 (ES2015/JavaScript.next/Harmony) like ?.在 ES6 (ES2015/JavaScript.next/Harmony) 中是否有一個null屬性訪問（null 傳播/存在）運算符，比如?. in CoffeeScript for example?例如在CoffeeScript中？ Or is it planned for ES7?還是計劃用於 ES7？

var aThing = getSomething()
...
aThing = possiblyNull?.thing

This will be roughly like:這將大致如下：

if (possiblyNull != null) aThing = possiblyNull.thing

Ideally the solution should not assign (even undefined ) to aThing if possiblyNull is null理想情況下，解決方案不應該分配（甚至undefined ），以aThing如果possiblyNull是null

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解決方案：

參考一： https://en.stackoom.com/question/2AqqE
參考二： https://stackoom.com/question/2AqqE