On 21.05.2009, at 01:42, Raoul Duke wrote: > Seems like Haskell's laziness has an aura of "it will bite you > performance-wise sooner or later." What is different (I'm asking > didactically, not snarkily) about Clojure's laziness? Does it manage > to avoid some aspects of the "uh ohs" in Haskell?
The main difference is that in Haskell, all evaluation is lazy, whereas in Clojure, only sequences are lazy by default. You can make your own lazy evaluation using delay, but if you do you know why you did it. This makes a big difference in terms of memory usage: for sequence processing, lazy evaluation actually helps in most cases, whereas elswhere its impact is difficult to estimate. In terms of CPU performance, lazy evaluation always entails an overhead. I can't say if there is an important difference between Haskell and Clojure implementation-wise. Konrad. --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
