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<p>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).<br>
</p>
<pre><span></span><a name="line-175"></a><span class="hs-keyword">newtype</span><span> </span><a name="IO"></a><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#IO"><span class="hs-identifier">IO</span></a><span> </span><a name="local-6989586621679009802"></a><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#local-6989586621679009802"><span class="hs-identifier">a</span></a><span> </span><span class="hs-glyph">=</span><span> </span><a name="IO"></a><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#IO"><span class="hs-identifier">IO</span></a><span> </span><span class="hs-special">(</span><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#State%23"><span class="hs-identifier hs-type">State#</span></a><span> </span><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#RealWorld" class=""><span class="hs-identifier hs-type">RealWorld</span></a><span> </span><span class="hs-glyph">-></span><span> </span><span class="hs-special">(#</span><span> </span><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#State%23"><span class="hs-identifier hs-type">State#</span></a><span> </span><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Prim.html#RealWorld" class=""><span class="hs-identifier hs-type">RealWorld</span></a><span class="hs-special">,</span><span> </span><a href="http://hackage.haskell.org/package/ghc-prim-0.5.2.0/docs/src/GHC.Types.html#local-6989586621679009802"><span class="hs-identifier hs-type">a</span></a><span> </span><span class="hs-special">#)</span><span class="hs-special">)</span><span></span></pre>
<br>
<div class="moz-cite-prefix">On 07/11/2018 09:14 AM, Stefan Monnier
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:jwv36wp986d.fsf-monnier+gmane.comp.lang.haskell.cafe@gnu.org">
<blockquote type="cite">
<pre wrap="">In a few weeks I'm giving a talk to a bunch of genomics folk at the Sanger
Institute<a class="moz-txt-link-rfc2396E" href="https://www.sanger.ac.uk/"><https://www.sanger.ac.uk/></a> 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.
</pre>
</blockquote>
<pre wrap="">
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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