Miss Dada  🏳️‍⚧️

this isn't really flatMap it's more like internal concat

It's sequenceA

sequenceA :: Applicative f => t (f a) -> f (t a)

I'm not sure that's what I want here, that looks like it's swapping two monads, which is what Promise.all does; it's [Promise a] -> Promise [a]

I want [Promise [a]] -> Promise [a]

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

I guess with the generic versions you can write a more generic version of exactly what you asked for