Can You Solve This JavaScript Problem?

Can you solve this JavaScript hard question based on short-circuit evaluation?

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[Nicoder]

a || b is effectively the same as a ? a : b

[javiervillacorta]

"so we are just geting whatever the f... irst value"
got me there.

[emmanuelmantilla]

Short circuiting is great specially with ??

[marcelolaurentinomelo]

Does it happens with any type ? If I have an Object in the first param and if it exists will return it ? Cuz so, I can use that instead of if(Object)

[shivanshsharma]

True1 || true2 = True1
True1 && true2 = true2

[KiriIrving]

Mathematically, logically, reasonably, this **should** return TRUE and i refuse to accept any other answer. Bad language, 2/10 (there's a lot of libraries and it runs in a web browser).

[ninhdang]

idk if I'd hate js for this 😂 but thanks to falsy truthy values, I don't have to write something like string.isNullOrEmpty in C#

[Vebol]

Wow another completely random useless thing

[tao]

Is JavaScript developed by fifth grader😅