i assume you are coming from a java background?
if so, every time you wrote this:
Result result = null;
for (Stuff s:stuffList) {
if (result ==null) result = ...
result.cuddleWith(s);
}
return result
a reducer would have been a functional alternative to this
Am 21.08.2012 13:04, schrieb Jim - FooBar();:
> Dear all,
>
> Can anyone redirect me to some 'real code' using reducers? I say
> 'real-code' cos I don't consider (r/fold + [1 2 3 4 5]) to be a
> realistic example of usage...also, apart from Rich's blogs, I'm having a
> hard time finding resources explaining the role of the
> combining/reducing fns. THe way I understand it, the entire reducers
> lib is only applicable (with benefits) to tree-like structures and so,
> the reducing fn is the one applied on the leaves to make them fewer
> (reduce them) and the combining fn is the one that essentially
> propagates the reductions back up the tree (combines them)... Can anyone
> confirm this understanding of mine?
>
>
> Assuming I'm thinking about it the right way, I 'd like to build a
> map-tree (nested maps) where the leaves will be reduced using 'max-key'
> and combined back up using 'r/cat' , which apparently is a:
> "high-performance combining fn that yields the catenation of the
> reduced values.". Does that make any sense whatsoever? I'm really
> struggling to replace (apply max-key #(...) (:children tree)) with some
> form of (r/fold r/cat #(max-key (fn [e] ....)) (:children tree))...
>
> I'd love to see some proper usage of reducers so I can understand what
> is going on...From all the videos I've watched, I 've understood that
> the algorithm I'm implementing (minimax) is an ideal candidate for
> reducers - however I've still not managed to tame them...any
> help/pointers will be massively appreciated! :-)
>
> Thanks in advance...
>
> Jim
>
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