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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