I feel that there are some misconceptions here, Clojure is not a language that has lazy evaluation, but is instead completely eager. Macros are the closest thing that come to laziness, but they are still different. However, Clojure has a data structure, that also serves as an abstraction layer, that implements laziness, called a sequence or seq.
Therefor "turning of laziness" makes no real sense. You could say "disable the laziness of seqs", but that doesn't really make sense either. It's like disabling the FIFO nature of a queue or a channel. If you don't want the properties of a seq, then use another data structure, like a vector. On 11 Oct 2014, at 18:14, Mars0i <marsh...@logical.net> wrote: > Thanks Jan-Paul. That's helpful. I wonder whether, if all lazy functions > were rewritten in terms of transducers, it would then be easy to turn > laziness on and off. (I am not suggesting that this should be done. No > doubt it would entail a lot of work, and performance tradeoffs. I'm quite > happy with Clojure as it is, despite anything negative I might say about > impacts of laziness in some circumstances.) > > On Saturday, October 11, 2014 5:00:36 AM UTC-5, Jan-Paul Bultmann wrote: > Transducers build up transformation steps, with new generic operations like > single arg `map` and `filter`, and then apply these transformations to a > collection using an evaluation function. > This function decides if operations are done lazily, eagerly, or on a channel. > > Note that while this makes the place where laziness occurs more obvious, it > is not really new. > You can currently infer as well that `map` `filter` `concat` e.t.c are lazy. > While `mapv` or `filterv` are not. > > > On 11 Oct 2014, at 00:28, Mars0i <mars...@logical.net> wrote: > >> >> >> On Friday, October 10, 2014 5:20:30 PM UTC-5, Mars0i wrote: >> Maybe an ideal world would be one in which there was a global setting to >> turn laziness on and off. When you want it, have it, and know your risks. >> After looking at the source for some of the lazy functions, I've come to >> suspect that such a feature would be completely nontrivial. >> >> Oh, wait, Rich Hickey's blog post about transducers says: >> >> But transducers can also be used for: >> >> a la carte laziness >> ... >> collection/iteration/laziness-free transforming reductions >> >> Not certain what this means. Haven't fully grokked reducers. >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@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+u...@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+u...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > > > -- > 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/d/optout. -- 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/d/optout.
