It is a singly linked list, so the natural position at which to add is the front. conj will add to the front of lists and to the end of vectors.
Consider using a vector if you want to append to the end. It'd be more semantically correct. More background: If you append to the end of a singly linked list, generally, you'd have to follow the references starting from the first element until you reached the last element. Clojure uses persistent data structures, meaning when you add an item to a collection you share structure with the original item. In the case of a singly linked list, adding an item to the front is as simple as creating a new list that points to the old list. E.g., adding 5 to the linked list 2 -> 3 -> 4 can be thought of as 5 -> 2 -> 3 -> 4. --- Joe R. Smith j...@uwcreations.com <mailto:j...@uwcreations.com> @solussd On Jul 17, 2021, at 2:21 PM, Tanya Moldovan <tanya.moldo...@gmail.com <mailto:tanya.moldo...@gmail.com> > wrote: Hi, conj <https://clojuredocs.org/clojure.core/conj> adds at the end of a vector, but at the beginning of a list. It is how it is implemented. I think this <https://stackoverflow.com/questions/5734435/put-an-element-to-the-tail-of-a-collection> and this <https://medium.com/@greg_63957/conj-cons-concat-oh-my-1398a2981eab> sums it up why. You could achieve what you want by using concat <https://clojuredocs.org/clojure.core/concat> (note this returns a LazySeq): user=> (concat grid '((off 1 2 3 6))) (-> (grid 10 10) (toggle 2 3 4 5) (off 2 3 4 5) (on 2 3 4 5) (off 1 2 3 6)) Though I'm not exactly sure what is the end goal of this but I'd rethink the way it is done. On Sat, 17 Jul 2021 at 14:24, SideStep <nesvarbu.vi...@gmail.com <mailto:nesvarbu.vi...@gmail.com> > wrote: <https://stackoverflow.com/posts/68420449/timeline> I have a representation of a matrix in grid.clj file: (-> (grid 10 10) (toggle 2 3 4 5) (off 2 3 4 5) (on 2 3 4 5)) It's a list of functionts, first one initializes a grid, others modify it. Clojures' 'code is data' supposed to make it easy for me to modify that representation by adding an instrucion at the end of collection. List is an ordered collection right? Order matters. How do I add an instruction to the end of the list then? Something like this: (def grid (read-string (slurp "grid.clj"))) (conj grid '(off 1 2 3 6)) Yet I can't add to the end of the list, which is a data structure that is evaluatable as code. How is it 'code as data' if I can't add to the end of the ordered collection that is meant for code (as data)? -- 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. 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