If that’s horror to you, you’ve been sheltered. That’s quite readable, though I’d make the long lines into their own subroutines.

Delightfully devilish, indeed. You made it as easy to read as possible though.

Why not factor out the ! via de Morgan’s laws (which would also remove most of the parentheses, as iirc && binds tighter than ||)? Also, does that language have a {#continue} sort of syntax for loops? If so, you could make it a guard clause.

What is that, Vue?