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52 lines
853 B
Elm
52 lines
853 B
Elm
module Effect exposing (Effect(..), batch, fromCmd, map, none, perform)
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import Http
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import Json.Decode as Decode
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type Effect msg
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= None
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| Cmd (Cmd msg)
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| Batch (List (Effect msg))
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none : Effect msg
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none =
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None
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batch : List (Effect msg) -> Effect msg
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batch =
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Batch
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fromCmd : Cmd msg -> Effect msg
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fromCmd =
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Cmd
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map : (a -> b) -> Effect a -> Effect b
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map fn effect =
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case effect of
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None ->
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None
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Cmd cmd ->
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Cmd (Cmd.map fn cmd)
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Batch list ->
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Batch (List.map (map fn) list)
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perform : (pageMsg -> msg) -> Effect pageMsg -> Cmd msg
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perform fromPageMsg effect =
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case effect of
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None ->
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Cmd.none
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Cmd cmd ->
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Cmd.map fromPageMsg cmd
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Batch list ->
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Cmd.batch (List.map (perform fromPageMsg) list)
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