Indeed, that would make sense for filter, but since filterv immediately puts them all into a vector, I was particularly puzzled by the warning on its doc string.
In my case I am not relying on the side effects for anything, I merely cannot guarantee there are none (and even if chunking were an issue, the list is immediately fully consumed). So I tentatively think I am ok, but it is still an unsettling warning. On Wednesday, September 2, 2015 at 11:06:01 AM UTC-5, Raymond Huang wrote: > > I believe the reason it's not recommended is because it returns a lazy > chunked sequence. This means that it's not guaranteed to eagerly perform > your side-effects, unless you wrap it in `doall`. > > On Wed, Sep 2, 2015 at 8:48 AM, James Elliott <brun...@gmail.com > <javascript:>> wrote: > >> I notice that the documentation for filter and filterv are emphatic that >> the predicate you are using be free of side effects. Why is that so? For >> example, I would like to use filterv to collect a list of lighting >> effects which respond false to a protocol method which asks whether they >> have finished. In the implementation of that method, the effects are free >> to update their internal state based on the current show state and time, >> when deciding whether or not they are finished, and so I can’t guarantee >> there will be no side effects while filtering the effects. Does that mean I >> can’t use filterv? If not, why not? Looking at the source, I see no >> obvious problems. >> >> -- >> 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 >> <javascript:> >> 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 <javascript:> >> 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 <javascript:>. >> 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.
