caseof alternatives and similar packages
Based on the "Development" category.
Alternatively, view caseof alternatives based on common mentions on social networks and blogs.
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cabal-install-parsers
Scripts and instructions for using CI services (e.g. Travis CI or Appveyor) with multiple GHC configurations -
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fourmolu
A fourk of ormolu that uses four space indentation and allows arbitrary configuration. Don't like it? PRs welcome! -
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WorkOS - The modern identity platform for B2B SaaS
Do you think we are missing an alternative of caseof or a related project?
README
caseof
A simple way to query constructors, like cases but slightly more concise.
Aimed at sum types with many constructors:
data Wiggle = Woo Int Char | Wibble Int deriving Show
There is a case predicate:
> $(isCaseOf 'Woo) (Woo 5 'a')
True
There is a Maybe-based matcher:
> $(maybeCaseOf 'Woo) (Woo 1 'a')
Just (1,'a')
There is a "map" over a constructor:
> $(mapCaseOf 'Left) succ (Left 3)
Left 4
There is a combinator which calls your function with n arguments, or passes the whole value to an "else" clause.
> $(caseOf 'Woo) (\x y -> show x ++ show y) (const "") (Wibble 5)
""
Use in your project
In your stack.yaml, put:
extra-deps:
- git: https://github.com/chrisdone/caseof.git
commit: 9a7f6bb
Lens prisms
For me, the lens approach (aside from being a big dependency) has
these downsides: a complicated set of types and a requirement to
derive prisms for the types, which enter the namespace. The downside
for caseof is the TH requirement, but it is dead simple. You just
read this README in 20 seconds.