[Haskell-cafe] Re: How does one get off haskell?

Alberto G. Corona agocorona at gmail.com
Fri Jun 18 09:25:32 EDT 2010

The fast write-only way:
- generate C code with JHC (no haskell runtime)
- use a C-to-java converter , for example, c2j  (http://www.novosoft-us.com)

At least you can laugh at the  generated code.
anyone  tried that?


2010/6/18 wren ng thornton <wren at freegeek.org>:
> Edward Z. Yang wrote:
>> Excerpts from Paul Lotti's message of Thu Jun 17 15:33:30 -0400 2010:
>>> Same feelings here.  I work in a company that uses C++/Java and the best
>>> I could
>>> manage was to use Haskell for prototyping and then deliver in Java.  This
>>> worked
>>> out twice so far.  The downside is having to translate it later.
>> *Shudders at the though.* Must be a what, x10 size blow-up?
> I've done that too. It works fairly well for certain kinds of
> programs/problems, but you have to be careful about your abstractions.
> For instance, Java Generics are no substitute for real parametric
> polymorphism. They only work for the simplest kind of container/element
> polymorphism, interact poorly (i.e., not at all) with subclassing, and
> explode with many of the higher-order tricks common in idiomatic Haskell.
> Any sort of higher-order programming (HOFs, point-free style, CPS,
> parametricity,...) rarely translates well--- especially if you want to avoid
> code bloat and have anything resembling idiomatic Java. Though sometimes
> defunctionalization[1] can help.
> The code blow up varies. 10x is on the good side of things and indicates a
> good match of abstractions. 20x or 30x is more common I think. But if you're
> relying on any libraries or fancy datastructures, you'll be lucky not to
> have to reimplement everything...
> [1]
> http://blog.plover.com/prog/defunctionalization.html
> http://www.brics.dk/RS/01/23/
> http://cristal.inria.fr/~fpottier/publis/fpottier-gauthier-popl04.pdf
> --
> Live well,
> ~wren
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