[Haskell-cafe] What is your favourite Haskell "aha" moment?

PY aquagnu at gmail.com
Mon Jul 16 07:50:47 UTC 2018

16.07.2018 09:44, Tom Ellis wrote:
> On Sat, Jul 14, 2018 at 10:17:43AM +0300, Paul wrote:
>>> Once the FSM holds more than a dozen states, these advantages evaporate.
>> This is point only where I can not agree.  I used FSM with hundreds
>> states/transitions.  It was automatically generated, I only check them.
>> Also I know that in car automatics FSM are widely used (BMW, Mercedes,
>> Audi).  Also it’s using in software for space industry widely.  My IMHO
>> is: FSM is most reliable way to do soft without bugs.  Also it’s easy to
>> verify them (for example, with transitions’ assertions)
> It's interesting to see all this chat about FSMs, when FSMs are essentially
> "just" a tail recursive function on a sum type.
Yes :) But more good is to represent FSM as table or diagram - then you 
can easy find right/wrong transitions/states. Any information can be 
represented in different forms but only some of them are good for human ;)

Btw, there are a lot of visual tools to work with FSMs, to develop them 
and tests as well as to translate them to some language.

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