Created
May 18, 2017 22:47
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Look Ma, no callbacks! (Using PureScript's Aff Monad with NodeJS.)
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module Main where | |
import Prelude | |
import Control.Monad.Aff (attempt, forkAff, launchAff) | |
import Control.Monad.Eff (Eff) | |
import Control.Monad.Eff.Class (liftEff) | |
import Control.Monad.Eff.Console (CONSOLE, log) | |
import Control.Monad.Eff.Exception (EXCEPTION) | |
import Data.Either (Either(..)) | |
import Node.Encoding (Encoding(..)) | |
import Node.FS (FS) | |
import Node.FS.Aff (readTextFile) | |
main :: forall e. Eff ( exception :: EXCEPTION | |
, fs :: FS | |
, console :: CONSOLE| e) Unit | |
main = void $ launchAff do | |
_ <- forkAff $ do | |
greet <- attempt $ readTextFile UTF8 "./greet.txt" | |
case greet of | |
Left err -> liftEff $ log "Error, yo!" | |
Right res -> liftEff $ log res | |
liftEff $ log "The last shall be first." |
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