Here's what I'd like to ask:
What is something that your language does, that is rare or nonexistent in other languages, and often comes in handy in code golfing? Please share a single function, statement, or other construct that is both uncommon in languages broadly and regularly useful for golfing in the language of your choice.
Is that allowed? I've never been quite clear about what sorts of non-competitive questions were appropriate for the site, so I thought I'd check here first. Also, if it is allowed, what do I tag it?