Yes I do have an OOP background but I don't see how that helps me...I've
not written Java in almost 3 years! and also I don't see how the for
loop can be parallelized...
In particular, I'm not sure how to replace the traditional '(apply
max-key #(...) (:children tree))' approach with the 'r/fold' equivalent.
btw (:children tree) is foldable cos it is the result of calling r/map.
Jim
On 21/08/12 17:17, Dennis Haupt wrote:
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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