@hackage / exceptional

Essentially the Maybe type with error messages.

Latest0.3.0.0

About

Metadata

  • Last updated , by pharpend
  • License BSD-2-Clause

  • Maintained by: peter@harpending.org

  • Lottery factor: 0

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Installation

Readme

exceptional

This is a Haskell library that exists to house a type:

data Exceptional x
  = Failure String
  | Success x

It's much like Maybe, except instead of Nothing, we have Failure String.

A comparison could also be made to Either String. I made this library because I was dissatisfied with the Monad instance for Either. In this type, fail = Failure. It's rather simple.

Installing

cabal install exceptional

Or, add exceptional to the build-depends field in your .cabal file.