> I'm no Haskell expert, but it doesn't take much Googling to give strong > evidence that the answer is "yes, you can get mutability in Haskell". > Search through this Haskell program on the Benchmarks Game site for > occurrences of the string "unsafe". >
I see; quite disgusting :) > In my experience writing Clojure programs for the Benchmarks Game, getting > within 10x is fairly easy, and doesn't require much knowledge other than > eliminating Clojure reflection, and using a decent algorithm that doesn't > throw in an extra factor of N by accident. It often helps to use mutable > Java arrays and Clojure loops, too. > The default Clojure idiom is lazy seqs and higher-order functions. That's what I have in mind when I say 100x slower. Loops, and especially arrays, are a clear sign of optimization; they never come as the most natural way to express a solution. In languages such as Java there is just one idiom: the performant one. That's why idiomatic Java performs well. In languages such as Clojure, the most expressive idiom, the one the language is appreciated for, is a level of abstraction or two above the performant idiom, so the interesting question becomes, how much performance can be engineered into *that* level of abstraction. The question of the absolute performance ceiling achievable within the language is also of interest, but only secondary. Now, my issue with a site such as the Benchmarks Game is that it will never give a fair representation of that concern, and I bet it is exactly this that most visitors of the site come looking for. That is what I meant when I said that Haskell is quite performant: I've heard *idiomatic* Haskell performs well. I really couldn't care less how it performs with those * unsafe* monstrosities. Those features are, and should be, reserved for the language's entrails, like the implementation of the IO monad. -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
