Actually I was just kicked out of paradise. concat always returns a list and does NOT return a vector for this (concat [1 2] [3 4]) sadly.
cs _______________________________________ Christian Seberino, Ph.D. Phone: (936) 235-1139 Email: cseber...@gmail.com _______________________________________ On Wed, Jul 18, 2018 at 2:16 AM, Didier <didi...@gmail.com> wrote: > It's never a good idea to use the wrong data structure for the job. > > And thus Clojure takes the stance that it won't make bad ideas easy for > you to use. Yet, it will never prevent you from doing anything. > > If you want to do something bad, you'll need to get your own hands dirty. > > That's why slow data structure access functions don't exist as standard. > That's why data transforms are lazy by default. And why the non lazy > variant (transducers) do loop fusion for you. That's why mutability is ugly > and requires you to wrap things in extra verbosity. That's why OOP isn't > there, and forces you to use the host interop if you want it. That's why > there's only recursive loops. Etc. > > The Clojure standard lib is opinionated. It's not trying to make > everything easy and convenient. It's trying to make things simple to reason > about, and promote Rich Hickeys opinion of what is a good idea, and what > isn't. > > But, it can afford to be this way, because it made itself a Lisp, meaning > it gave you all the power needed to disagree and make your own core, which > follows your own opinions of good and bad.[1] > > Now, I recommend that everyone should have a core library of their own > that they keep around for cases like this, where they disagree. > > And for beginners, I mean, what are you trying to teach them? What problem > requires them to add items to the beginning and end of an ordered > collection? > > Anyways, my advice is to teach them concat. It's even nicer then > append/prepend. You just give it the arguments where you want them to go. > > (concat [1] [2 3]) > > (concat [1 2] [3]) > > And it works for any type of ordered collections, even arrays. > > Also, this blog I think does a great job at teaching all this to a > beginner https://medium.com/@greg_63957/conj-cons-concat-oh-my- > 1398a2981eab > > > > [1] Except for reader macros. Rich didn't want you to be able to change > the whole program syntax in unconstrained ways. That's probably a good > thing to at least keep the foundation universal accross code bases. > > -- > 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.
