Hello, I am just getting started with Clojure and I had a question. I have to following code:
(get-rss-entry (get-rss-feeds h-res) url) The call to get-rss-feeds returns a lazy sequence of URLs of feeds that I need to examine. The call to get-rss-entry looks for a particular entry (whose :link field matches the second argument of get-rss-entry). It examines, one-by-one, the lazy sequence returned by get-rss-feeds. Evaluate each item requires an http request across the network to fetch a new rss feed. Therefore, to minimize the number of http requests it's important to examine the sequence one-by-one and stop as soon as there is a match. Here is the code: (defn get-rss-entry [feeds url] (first (drop-while empty? (map #(entry-with-url % url) feeds)))) entry-with-url returns a lazy sequence of matches or an empty sequence if there is no match. First, I want to make sure I understood lazy evaluation correctly and that I did this right. I tested this and it seems to work correctly. Second, not sure if I am solving this problem idiomatically. In Java, for example, this would likely be solved with a loop examining some data structure. At first I did it with a loop/recur but that didn't seem like the right way to do it. Also I saw somewhere that looping in considered low level in Clojure or something to that effect. I would appreciate your feedback. Thanks for your help. -- 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
