["Request"] Suspend version of map-like functions about arrow-core HOT 7 CLOSED

FOr 0.10, using fold

getConfiguration().fold(
  { /* error handling */}, 
  { getMovies(it) }
)

In 0.11, use IO<E, A>, which should come with them: arrow-kt/arrow-fx#145

from arrow-core.

This is only possible exploiting the inline trick in fold since any of those functions would need to have a continuation and map, flatMap, etc can capture the lambda context which would escape the continuation.

from arrow-core.

Not necessarily fold, just using when works too. It cannot be part of the regular hierarchy because some Functors are not like that, i.e. Function1

from arrow-core.

If we would like to include this as part of Async then fine for me, but otherwise I would raise a "What would be the benefit for devs regarding this?" Since I'm unsure because right now I have troubles explaining the Either.catch to myself or how to use it properly, despite the fact that BIO will have this kind of API already.

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Async already has this https://github.com/arrow-kt/arrow-fx/blob/043c0eccc7f3748fcbf469ad77c326048ad02cb3/arrow-fx/src/main/kotlin/arrow/fx/typeclasses/Async.kt#L343 effectMap

from arrow-core.

How can I currently in the simplest way chain suspending functions returning Either?

suspend fun getConfiguration(): Either<Exception, Config>
suspend fun getMovies(config: Config): Either<Exception, List<Movie>>

GlobalScope.launch {
    getConfiguration()
        .flatMap { config -> getMovies(config) }
        .fold { /* ... */ }
}

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AFAIK we can use crossinline to restrict non-local returns, so this shouldn't be a problem. Closing in favour of #115

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