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PO
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Id
1990494
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CreationDate
2010-01-02T03:17:26.127
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2013-01-21T16:47:26.257
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2013-01-21T16:47:26.257
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139746
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139746
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1990464
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2
Score
34
ViewCount
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LastEditorDisplayName
text
Body
<a href="http://www.lri.fr/~conchon/publis/conchon-ml07.ps" rel="noreferrer">This article</a> claims that the known purely functional implementations of <a href="http://en.wikipedia.org/wiki/Disjoint-set_data_structure" rel="noreferrer">the union-find algorithm</a> all have worse asymptotic complexity than the one they publish, which has a purely functional interface but uses mutable data internally. The fact that other answers claim that there can never be any difference and that for instance, the only "drawback" of purely functional code is that it can be parallelized gives you an idea of the informedness/objectivity of the functional programming community on these matters. EDIT: Comments below point out that a biased discussion of the pros and cons of pure functional programming may not come from the “functional programming community”. Good point. Perhaps the advocates I see are just, to cite a comment, “illiterate”. For instance, I think that this <a href="http://augustss.blogspot.co.il/2011/05/more-points-for-lazy-evaluation-in.html" rel="noreferrer">blog post</a> is written by someone who could be said to be representative of the functional programming community, and since it's a list of “points for lazy evaluation”, it would be a good place to mention any drawback that lazy and purely functional programming might have. A good place would have been in place of the following (technically true, but biased to the point of not being funny) dismissal: <blockquote> If strict a function has O(f(n)) complexity in a strict language then it has complexity O(f(n)) in a lazy language as well. Why worry? :) </blockquote>
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1. POEfficiency of purely functional programming
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1. USPascal Cuoq
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1. USPascal Cuoq
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