Another way to think about it is lists and vectors are different and the idiomatic way to add items to them is different. A (singly-linked) list is usually prepended to (otherwise you have to walk the entire list to find the end). A vector is usually added to at it’s n+1 index, where n is the size of the vector. The conj function is polymorphic.
cons takes a seq and returns a seq. It only cares that it can get a seq on whatever collection you give it and will always prepend to that seq. On Jul 16, 2018, at 3:15 PM, Christian Seberino <cseber...@gmail.com <mailto:cseber...@gmail.com> > wrote: I'm impressed with Clojure syntax and I'm still a beginner. I noticed conj behaves differently for lists and vectors. I also noticed cons does not return a vector for a vector input. Is there any downside to make 2 macros...prepend and append that behave the same for lists and vectors, and also, return same types as inputs? If I'm not mistaken, I believe it is for performance reasons that these are not already in the standard language? For those that care about performance, it would be beholden on them to pick the correct macro for their specific data structure. Good idea? Thanks! Chris -- 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 <mailto: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 <mailto:clojure+unsubscr...@googlegroups.com> For more options, visit this group at http://groups.google.com/group/clojure?hl=en <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 <mailto: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.
