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The language itself is lovely. What parts of cocoa feel essential to you?

Actually, if you want to do backends, nothing is essential from Cocoa itself.

I think Foundation might be necessary though, even if you just use Swift structs (Array, Dictionary, etc)

This. I'm SUPER excited to have a Swift backend for a web app, and/or I've been toying around with the core logic of another app. Either idea doesn't need anything in the way of GUI, just the standard library and maybe a few things from Foundation that should be in the standard library anyway (like pseudorandom number generation).

"Essential" ? Any of the objects that can give a "dashboard" interface and maybe draw a picture.

I'd love a portable GUI API that satisfies some harsh conditions: 1) Portable between mac,linux,windows,android,ios. [ must re-compile to target ] 2) Compilable into a single static binary. 3) New developments don't break backwards compatibility.

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