mirror of
https://github.com/roc-lang/roc.git
synced 2025-09-30 15:21:12 +00:00
28 lines
734 B
Text
28 lines
734 B
Text
interface Task
|
|
exposes [ Task, putLine, after, always, map, after, fail]
|
|
imports [ Effect ]
|
|
|
|
Task a err : Effect.Effect (Result a err)
|
|
|
|
always : a -> Task a *
|
|
always = \x -> Effect.always (Ok x)
|
|
|
|
fail : err -> Task * err
|
|
fail = \x -> Effect.always (Err x)
|
|
|
|
putLine : Str -> Task {} *
|
|
putLine = \line -> Effect.map (Effect.putLine line) (\_ -> Ok {})
|
|
|
|
map : Task a err, (a -> b) -> Task b err
|
|
map = \task, transform ->
|
|
Effect.map task \res ->
|
|
when res is
|
|
Ok x -> Ok (transform x)
|
|
Err e -> Err e
|
|
|
|
after : Task a err, (a -> Task b err) -> Task b err
|
|
after = \task, transform ->
|
|
Effect.after task \res ->
|
|
when res is
|
|
Ok x -> transform x
|
|
Err e -> Task.fail e
|