[Haskell-cafe] How to express a logic matrix clearly?
vanessa.mchale at iohk.io
Fri May 17 03:24:59 UTC 2019
For one, you should pattern match rather than using nested ifs, viz.
foo A1 B1 = fun1
Using a case statement on tuples is not necessary.
On 5/17/19 3:12 AM, Magicloud Magiclouds wrote:
> I have trouble describing this clearly. Let me show code directly.
> data Rule1 = A1 | A2 | A3
> data Rule2 = B1 | B2 | B3
> foo a b =
> if a == A1
> then if b == B1
> then fun1
> else if b == B2
> then fun2
> else if b == B3
> then fun3
> else fun4
> Basically, Rule1 and Rule2 compose a matrix, for each case of Rule1
> and Rule2, I need to do different things. Above is already long and
> not quite clear, and it is far from complete.
> So my question is, is there a way/lib that I can make this clear to
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