On Sep 23, 1:39 am, Nathan Sorenson <n...@sfu.ca> wrote: > Just to clarify, you want to conj a vector to itself? i.e. [1 2 3 4] --> [1 > 2 3 4 [1 2 3 4]] I'm curious what the application of this is. > > Regarding the overhead of conj-ing to a vector: Clojure's data structures > make use of structural sharing so conjoining an element to the end of a > vector won't require any copying of entire vectors. It's a cheap, > constant(ish) time operation.
Good: (conj v v) is O(1) in time and space, and appends an element distinct from the preceding elements (if any). I meant to add that querying the vector is not allowed. The reason is to use reduce in situations where some data structure is created based on a previous and current element. If the last element is guaranteed to be different from those preceding it, then an edge case is eliminated (or rather, encoded into the sequence at minimal cost). -- 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
