On Thu, Sep 27, 2012 at 8:26 AM, arekanderu <arekand...@gmail.com> wrote: > Thank you Meikel for your so helpful replies. >
Thanks also from a lurker, to whom these facts were a useful surprise: I'd wondered the same myself. Cheers, R > > On Thursday, September 27, 2012 4:19:44 PM UTC+3, Meikel Brandmeyer > (kotarak) wrote: >> >> Hi, >> >> Am Donnerstag, 27. September 2012 12:16:41 UTC+2 schrieb arekanderu: >> >>> I am new to clojure and I have two questions about do and the way it >>> should be used. >>> >>> Question 1: Which of the following two functions is more idiomatic and >>> why? Both functions produce the same result. >>> >>> <code> >>> (defn my-fn [java-object] >>> (. java-object firstFunc) >>> (. java-object secondFunc) >>> (. java-object thirdFunc) >>> java-object) >>> </code> >> >> >> The first because defn includes an implicit do. So the second example is >> actually (do (do ...)). >> >> In this case you could also use doto: >> >> (defn my-fn >> [pojo] >> (doto pojo >> .firstFunc >> .secondFunc >> .thirdFunc)) >> >> >>> >>> Question 2: Again, which one is more idiomatic and why? Both functions >>> produce the same result. >>> >>> <code> >>> (defn my-fn [java-object bar] >>> (let [bar-bar (. java-object getSomething) >>> _ (if (not (is-bar? bar)) >>> (. java-object (setSomething bar-bar)))] >>> java-object)) >>> </code> >>> >>> <code> >>> (defn my-fn [java-object bar] >>> (let [bar-bar (. java-object getSomething)] >>> (do >>> (if (not (is-bar? bar)) >>> (. java-object (setSomething bar-bar))) >>> java-object))) >>> </code> >> >> >> The third: >> >> (defn my-fn >> [pojo bar] >> (let [bar-bar (.getSomething pojo)] >> (when-not (is-bar? bar) >> (.setSomething pojo bar-bar)) >> pojo))) >> >> let also (just like defn) includes an implicit do for the body. >> >> Hope this helps. >> >> Kind regards >> Meikel >> -- Russell Whitaker http://twitter.com/OrthoNormalRuss / http://orthonormalruss.blogspot.com/ http://www.linkedin.com/pub/russell-whitaker/0/b86/329 -- 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
