Using void 0 instead of undefined is just ridiculous. Sure, you save 3 bytes but I've seen the code you write, you definitely should not care about that.

Jesse, what the fuck are you talking about?

Eh?

@iiii

In the codebase I'm working with it's full of void 0 used instead of undefined. It's functionally the same just way less clear.

That usually the result of using for example googles closure compiler for js.

Its a minimizer that can do some other things to.
And yes its only 3 bytes, but if your going to make the code almost unreadable anyway, saving upwards half of it, why not save every byte you can.

But I would never ever accept it for hand written code, specifically due to readability.

WHAT IS VOID 0

@Ranchonyx

It's literally undefined

@Ranchonyx its a trick way to write undefined using 3 chars less and used in minimizer solutions.

It has no other usage.