discrete alternatives and similar packages
Based on the "discrete" category.
Alternatively, view discrete alternatives based on common mentions on social networks and blogs.
Do you think we are missing an alternative of discrete or a related project?
README
Discrete
This library provides a typeclass replacement for 'GHC.Enum.Enum' called 'Discrete'. The motivation for 'Discrete' is that Enum, to paraphrase David Feuer, is a typeclass that does too many things, and does them poorly.
The laws of 'Discrete' are simple:
A discrete type is a set X with at least one element, along with two functions, succ :: X -> Maybe X, and pred :: X -> Maybe X, such that the following hold:
Succ retracts pred: pred >=> succ >=> pred = pred, Pred retracts succ: succ >=> pred >=> succ = succ, For any (x : A), all values in X can be constructed with only x, succ, and pred.
This means that 'Int' is a discrete type, because given any x : Int, one can construct any other Int with succ x = x + 1, and pred x = x - 1.
This also means that 'Double' is not a discrete type, because given any x : Double, one cannot construct any and all Doubles with any non-arbitrary and/or meaningful 'succ' and 'pred'1.
(1): Given (.5 : Double), how would one define 'succ' and 'pred' such that one can "reach" both values (1 : Double) and (π : Double)?