roc/examples/effect/Main.roc

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app Main provides [ main ] imports [ Effect, RBTree ]
toAndFro : Int
toAndFro =
empty : RBTree.Dict Int Int
empty = RBTree.empty
empty
|> RBTree.toList
|> List.len
main : Effect.Effect {} as Fx
main =
# if RBTree.isEmpty empty then
if toAndFro == 2 then
Effect.putLine "Yay"
|> Effect.after (\{} -> Effect.getLine)
|> Effect.after (\line -> Effect.putLine line)
else
Effect.putLine "Nay"
# Effect.always "Write a thing"
# |> Effect.map (\line -> Str.concat line "!")
# |> Effect.after (\line -> Effect.putLine line)
# |> Effect.after (\{} -> Effect.getLine)
# |> Effect.after (\line -> Effect.putLine line)