Thank you Meikel for your so helpful replies. 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 > >
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