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

[Vanessa McHale]

I find it quite elegant! The fact that you can define the IO monad in
Haskell was quite a revelation. And it's especially nice when paired
with a demonstration of C FFI (where you might *need* to sequence side
effects such as freeing a value after it has been read).

newtypeIO
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#IO>a
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#local-6989586621679009802>=IO
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#IO>(State#
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#State%23>RealWorld
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#RealWorld>->(#State#
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#State%23>RealWorld
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#RealWorld>,a
<http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#local-6989586621679009802>#))


On 07/11/2018 09:14 AM, Stefan Monnier wrote:
>> In a few weeks I'm giving a talk to a bunch of genomics folk at the Sanger
>> Institute<https://www.sanger.ac.uk/> about Haskell.   They do lots of
>> programming, but they aren't computer scientists.
>> I can tell them plenty about Haskell, but I'm ill-equipped to answer the
>> main question in their minds: why should I even care about Haskell?  I'm too
>> much of a biased witness.
> I don't much like the monad solution for side-effects, but if those guys
> might have some knowledge of the horror of concurrent programming with
> locks, the STM system would be a good candidate.
>
>
>         Stefan
>
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-- 



*Vanessa McHale*
Functional Compiler Engineer | Chicago, IL

Website: www.iohk.io <http://iohk.io>
Twitter: @vamchale
PGP Key ID: 4209B7B5

Input Output <http://iohk.io>

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