Tricky JavaScript Interview Problem

Do you know the answer to this tricky javascript interview problem about objects and their properties?
Even if you correctly guess the answer, do watch till the end because I also talk about a new and cool ES6 feature related to the same problem.
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Comments

[Soham Mondal]

I knew that the answer would be undefined, but wasn't aware of this

var person = { [key] : "Sherlock" } 

Thanks! 😄

[Satyam Yadav]

I am glad that you got to know something new.