Re: Insert into an indexed seq

On Apr 27, 2010, at 2:45 PM, Sean Devlin wrote: You're right, inserting into a vector is fundamentally slow. Inserting into a list (must traverse elements) or String (Char Array) isn't any better. I get why Clojure doesn't include certain operations on certain data structures (e.g. assoc on a

Re: Insert into an indexed seq

On Apr 27, 7:45 pm, Sean Devlin wrote: > However, there are still problems > that require me to use an expensive operation. Could you give an example of such a problem? There may be another way of solving it you have not considered. - James -- You received this message because you are subscrib

Re: Insert into an indexed seq

On Tue, Apr 27, 2010 at 3:41 PM, Mark J. Reed wrote: > I'm a bit surprised that it's not there already, at least in > clojure.contrib, but it's not hard to write, at least for vectors: > > (defn insert [vec pos item] > (apply merge (subvec vec 0 pos) item (subvec vec pos))) > Er, that should

Re: Insert into an indexed seq

I'm a bit surprised that it's not there already, at least in clojure.contrib, but it's not hard to write, at least for vectors: (defn insert [vec pos item] (apply merge (subvec vec 0 pos) item (subvec vec pos))) On Tue, Apr 27, 2010 at 2:45 PM, Sean Devlin wrote: > You're right, inserting i

Re: Insert into an indexed seq

You're right, inserting into a vector is fundamentally slow. Inserting into a list (must traverse elements) or String (Char Array) isn't any better. I get why Clojure doesn't include certain operations on certain data structures (e.g. assoc on a list), because it's the wrong tool for the job. Howe

Re: Insert into an indexed seq

On Tue, Apr 27, 2010 at 1:31 PM, Sean Devlin wrote: > Is there a built in to insert a value into an "indexed" seq? > > For example: > > user=> (insert [:a :b :c :d] 2 :q) > (:a :b :q :c :d) > > Not sure if I'm missing something simple... That's a vector, which cannot efficiently splice internally

Re: Insert into an indexed seq

Also, why does this work: user=> (assoc [:a :b :c :d] 2 :q) [:a :b :q :d] And this doesn't: user=> (dissoc [:a :b :c :d] 2) # Annoying. On Apr 27, 1:24 pm, Sean Devlin wrote: > Is there a built in to insert a value into an "indexed" seq? > > For example: > > user=> (insert [:a :b :c :d] 2 :q)

Insert into an indexed seq

Is there a built in to insert a value into an "indexed" seq? For example: user=> (insert [:a :b :c :d] 2 :q) (:a :b :q :c :d) Not sure if I'm missing something simple... Sean -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, se