To me, Changing type or order is a lack of facility for basic task. In the end comping task is also become more hard. Have you tried to use Specter? Why do you not consider Specter lib?
Br, Mamun On Friday, September 9, 2016 at 12:23:37 PM UTC+2, Colin Yates wrote: > > Hi all, > > So in the spirit of exposing my ignorance to the internet :-), I have just > been bitten by a bug due to the behaviour of the core libraries which I > find really surprising: > > (def v [1 2 3]) > (conj v 4) => [1 2 3 4] > (conj (map identity v) 4) => (4 1 2 3) > (conj (remove (constantly false) v) 4) => (4 1 2 3) > (conj (filter identity v) 4) => (4 1 2 3) > > In other words, I was relying on map, remove and filter preserving the > semantics (other than laziness) of the structure of the input, give it a > vector and you get a vector-like lazy sequence. This turns out not to be > the case. > > Now, I know there is mapv which returns a vector but why isn't there a > removev and a filterv etc.? > > What makes it more onerous for me is the fact conj states that its > behaviour differs depending on the concrete type, which is great, but how > am I supposed to know which concrete type is returned from > map|filter|remove? My assumption was it would be semantically equivalent to > the input (i.e. a vector in this case). > > The reason I have dodged this is because I don't frequently rely on vector > semantics but I am surprised this isn't better documented? > > Is it me? > > Thanks, > > Colin > -- 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.
