readLn

readLn :: Read a => IO a
base Prelude System.IO, ghc-internal GHC.Internal.System.IO
The readLn function combines getLine and readIO. This operation may fail with the same errors as getLine and readIO.

Examples

>>> fmap (+ 5) readLn
> 25
30

>>> readLn :: IO String
> this is not a string literal
*** Exception: user error (Prelude.readIO: no parse)
readLn :: Read a => IO a
hedgehog Hedgehog.Internal.Prelude, base-compat Prelude.Compat, base-prelude BasePrelude, numeric-prelude NumericPrelude NumericPrelude.Base, Cabal-syntax Distribution.Compat.Prelude, numhask NumHask.Prelude, clash-prelude Clash.HaskellPrelude, github GitHub.Internal.Prelude, ghc-lib-parser GHC.Prelude.Basic, prelude-compat Prelude2010, pathtype System.Path.IO, dimensional Numeric.Units.Dimensional.Prelude, rebase Rebase.Prelude, hledger Hledger.Cli.Script, mixed-types-num Numeric.MixedTypes.PreludeHiding, xmonad-contrib XMonad.Config.Prime, constrained-categories Control.Category.Constrained.Prelude Control.Category.Hask, copilot-language Copilot.Language.Prelude, LambdaHack Game.LambdaHack.Core.Prelude, cabal-install-solver Distribution.Solver.Compat.Prelude, faktory Faktory.Prelude, vcr Imports, yesod-paginator Yesod.Paginator.Prelude, distribution-opensuse OpenSuse.Prelude, hledger-web Hledger.Web.Import, termonad Termonad.Prelude
The readLn function combines getLine and readIO.
readLn :: Read a => IO a
ghc GHC.Prelude.Basic
readLn :: (MonadIO m, Read a) => Producer' a m ()
pipes Pipes.Prelude
read values from stdin, ignoring failed parses
readLn :: (MonadIO m, Read a) => Stream (Of a) m ()
streaming Streaming.Prelude
Read values from stdin, ignoring failed parses. 
>>> :set -XTypeApplications

>>> S.sum $ S.take 2 (S.readLn @IO @Int)
10<Enter>
12<Enter>
22 :> ()

>>> S.toList $ S.take 2 (S.readLn @IO @Int)
10<Enter>
1@#$%^&*\<Enter>
12<Enter>
[10,12] :> ()
readLn :: (MonadIO m, Read a) => m a
basic-prelude BasicPrelude
The readLn function combines getLine and readIO.
readLnB :: BufferM YiString
yi-core Yi.Buffer.HighLevel Yi.Config.Simple, yi Yi.Buffer.HighLevel
Read the line the point is on