He's making a train

Nesting ternary. No thanks.

Not very good readability

Clever, but I don't see how nesting ternary operators is a good practice.

Inception style conditional operators. Mind blown.

Clever in one line, but pretty difficult to read

This hurts my eyes

The purpose is to finish in one line, not to be readable. I think it's funny.

hard to read solution

This is awfully hard to read or extend.

The guy really did his magic there.

It's not a point. Do you think it's enough readable to put into production? This solution shouldn't be on production. I think solution with 'switch' is much better.

it is easy to read if you understand it.

What the... Who pressed 'Best Practices' button?
It's not best practice, uneasy to read.