<@U092308M7> The very first argument in the corout...

# random

[cedric]

@orangy The very first argument in the coroutine article is:

Note that we have a callback inside a callback here, and while it saves us from a lot of boilerplate (e.g. there's no need to pass the buf parameter explicitly to callbacks, they just see it as a part of their closure), the indentation levels are growing every time,

Rx is a good example that you can have multiple calls on multiple threads and yet, zero indentation nor callback hell. flatMap takes care of keeping things tidy while offering composable success/failure/error management