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Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

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© 2006-2013 Andrew Cooke (site) / post authors (content).

Functional Programming in Java

From: "andrew cooke" <andrew@...>

Date: Wed, 11 Jan 2006 07:20:05 -0300 (CLST)

(From Phil (thanks!))

FunctionalJ is a library which makes it easy to use functional programming
patterns in Java code.

FunctionalJ provides the following features:

    * Easily represent functions as objects
    * Dynamically invoke a constructor, instance method, or static method
    * Use currying (partial function application)
    * Write methods which accept functions as parameters and/or return
functions as a result (higher-order functions)
    * Replace procedural code with functional code for simpler, less
error-prone computations
    * Code with functional programming patterns such as mapping,
filtering, folding, scanning, and more.

http://functionalj.sourceforge.net/


Introduced at http://www.theserverside.com/news/thread.tss?thread_id=38430

There's an interesting comment from someone who had implemented a similar
library at
http://www.theserverside.com/news/thread.tss?thread_id=38430#196743 - they
found that debugging was very difficult.


This also reminded me of my attempts at something related. In the xpath
parser code I found that iterators made functional-like code very
difficult because they had internal state.  So I introduced something more
like pointers/references which I called cursors.  The odd thing being that
"null cursors" (used to indicate the end of a sequence, for example)
worked best if they returned random values rather than throwing
exceptions.  Yes, that makes little sense to me, too - I can't remember
any more than that and the comments at
http://www.acooke.org/jara/org-acooke/org/acooke/cursor/package-summary.html
are rather cryptic...

Andrew

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