[Haskell-cafe] What is your favourite Haskell "aha" moment?
jerzy.karczmarczuk at unicaen.fr
Wed Jul 11 13:07:56 UTC 2018
Neither Simon, nor the five responders ever mention *laziness*!
For me it was THE "aha" moment, or rather a long period...
The problem with popularizing laziness is that too many short comments
(on Internet) on it are not serious. People speak mainly about infinite
lists (as if somebody really cared about this "infinity"), or that lazy
program do not evaluate some expressions, which should *economise* some
time, which usually is not true...
For me, lazy programs permit to represent dynamic processes as data.
Iterations as mathematical structures.
Co-recursive perturbational schemes (or asymptotic expansions, etc.),
which are 10 or more times shorter than the orthodox approaches, and
remain readable, and natural.
Laziness makes it possible to play with continuations, thus: "making
future explicit", in a particularly constructive manner.
Somebody mentioned "type families".
Why not, but for an audience outside of the FP realm??
If something about types, then for sure the automatic polymorphic
inference, which remains a bit mysterious for many people, including my
(comp. sci.) students. And the /*Curry-Howard correspondence*/.
All the best.
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
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