I did look at Specter and it looks nice and well engineered, but I never really ran into the sorts of problem it solves, at least not enough to warrant the cost of depending on a new library.
On Fri, 9 Sep 2016, at 12:49 PM, Mamun wrote: > 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. -- 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.
