I'm reading _The Joy of Clojure_ right now, and they touch on it, which is nice coming from Scheme/Racket.
On Thu, Sep 27, 2012 at 10:40 AM, Russell Whitaker <russell.whita...@gmail.com> wrote: > 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 -- ((λ (x) (x x)) (λ (x) (x x))) http://www.wisdomandwonder.com/ ACM, AMA, COG, IEEE -- 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
