Miss Dada  🏳️‍⚧️

If you can go `[Promise a]` to `Promise [a]` you can go `[Promise [a]]` to `Promise [[a]]` which is good enough since you can go from `[[a]]` to `[a]`

Which... Isn't helpful at all to your original tweet now that I've read it again, since `Promise.all(promises).then(Array.prototype.flat)` is a thing, and having those be more generic isn't remotely helpful for what you asked for

it's not necessarily that I want it to be any more generic than promises or arrays, I just have an aversion to flat() on principle unless it's essentially flatMap(id)

Is it not?

I think the JS one has a specifiable depth but I can never remember how it works across different languages and data structures; I just think it's an over-complicated function

Apparently it removes "array holes" which I did not know was a thing until right now. Apparently `[1, , 2]` is a thing (and is not the same as `[1, undefined, 2]`)

yyeeeeaaahhh

the example I gave when this was being added to the lang is, what happens if you flatten [1, new Set([2, [3]]), 2, null, "hello"] I don't believe there's a well-defined answer to this question and I get tired just thinking about it