On Dec 25, 9:08 am, "Heinz N. Gies" <he...@licenser.net> wrote: > On Dec 23, 2009, at 6:04 , Nicolas Buduroi wrote: > > > Hi, today I needed to use the map function on multiple collections > > which didn't had all the same length. In this case, it returns a > > sequence of the size of smallest one. But the problem I was facing was > > required to map until the end of the longest, padding the smaller ones > > with a default value. I came up with this: > > No code but an idea, calling length on the collection might force them to be > itterated entirely why not define something like a lazy seq that takes: > > 1) the sequence to extend > 2) the default value > 3) a number of other sets > > As long as any of the lists is not epty return either first or the default > value, this saves iterating through all lists, and is lazy :) > > A quick not tested and proably horribl wrong example: > > (defn extend-list [main-list default & other-lists] > (if (some #(not (empty? %)) other-lists) > (if > (cons > (empty? main-list) default (first main-list)) (apply extend-list > (next main-list) default (map next other-lists))))) > > (this is not tested and just an idea, sorry short in time!
I'll have a look at this, it would certainly make this function more idiomatic to Clojurians. Thanks for the suggestion. -- 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
