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Comment by nonrandomstring | Hacker News Reader

In Perl I once saw someone write;

  unless predicate
    do this
  else unless impossible_thing
    do the impossible

What it did at runtime I have no idea, but it broke my brain for the rest of the week.

    if !cond1
        do this
    elsif !cond2
        do that

it's literally just `!` equivalent. Honestly I haven't seen much code using unless in wild. Especially that it is literally shorter to just !

there is no else unless (or even elsunless, since this isn't javascript) in Perl, might have been

    unless (predicate) {
       do_this;
    } else {
       do_the_impossible unless impossible_thing;
    }