Is it possible to have `undefined` in an array?

[ashen forum]

const a = ["A", "B", undefined]
for (const element of a) {
    print(element);
}

[humble garden]

https://typescripttolua.github.io/docs/caveats#array-length
https://typescripttolua.github.io/docs/caveats#table-key-deletion--existence

[zinc ravine]

Why would you work with undefined? Just remove the object

[brazen harness]

couldn't you just use a substitute if you specifically want something to unavailable?
just set it to a blank string and check if it's set to that
I can't imagine a reason you would specifically need it to be undefined and not just... not defined the same way as everything else

[ashen forum]

I'm using Symbol("undefined") with typeof MySymbol now.
Just wanted to know if it is possible.

[zinc ravine]

Again, why?

What is the usecase of using undefined