A better Prelude. Haskell’s Prelude needs to maintain backwards compatibility and has many aspects that no longer represents best practice. The goals of classy-prelude are:
remove all partial functions
modernize data structures
generally use Text instead of String
encourage the use of appropriate data structures such as Vectors or HashMaps instead of always using lists and associated lists
reduce import lists and the need for qualified imports
Most of this functionality is provided by mono-traversable. Please read the README over there. classy-prelude gets rid of the o prefix from mono-traversable functions.
Text
Lots of things use Text instead of String.
Note that show returns a String.
To get back Text, use tshow.
other functionality
exceptions package
system-filepath convenience functions
whenM, unlessM
hashNub and ordNub (efficient nub implementations).
Using classy-prelude
use the NoImplicitPrelude extension (you can place this in your cabal file) and import ClassyPrelude
use base-noprelude in your project and define a Prelude module that re-exports ClassyPrelude.
