Hi, Bill.
oh, letfn is what I wanted ! Thank you.
Sorry, I missed preview disqussion.
letfn - mutually recursive local functions
http://groups.google.com/group/clojure/browse_thread/thread/a7aad1d5b94db748
letfn is pretty good.
---------------------------------------------------------------------------
(defn aaa1 []
(letfn [(bbb [] 1)]
1))
user> (time (dotimes [_ 10000000] (aaa1)))
"Elapsed time: 100.981 msecs"
nil
---------------------------------------------------------------------------
Hi Kevin.
I have understood that def is not lexical scoped.
---------------------------------------------------------------------------
(defn aaa1 []
(defn bbb [] 1)
1)
user> (aaa)
1
user> bbb
#<user$aaa1__2324$bbb__2326 user$aaa1__2324$bbb__2...@55eef3c1>
---------------------------------------------------------------------------
Thank you!
On 2月11日, 午前8:01, Kevin Downey <redc...@gmail.com> wrote:
> scheme's define is scoped inside a function. clojure is not scheme.
> clojure's def (which defn uses) is not lexical or scoped in anyway, it
> always operates on global names. if you want lexical scope please use
> one of clojure's lexical scoping constructs, let or letfn.
>
>
>
>
>
> On Wed, Feb 10, 2010 at 1:28 PM, Hozumi <fat...@googlemail.com> wrote:
> > Hi all.
> > Is it not recommended to use defn within defn?
>
> > Normal function is faster than the function which has inner function
> > which actually doesn't run.
> > ---------------------------------------------------------------------------
> > ---
> > (defn aaa1 []
> > (defn bbb [] 1)
> > 1)
>
> > (defn aaa2 [] 1)
>
> > user> (time (dotimes [_ 10000000] (aaa1)))
> > "Elapsed time: 4083.291 msecs"
> > nil
> > user> (time (dotimes [_ 10000000] (aaa2)))
> > "Elapsed time: 58.34 msecs"
> > nil
> > ---------------------------------------------------------------------------
> > ---
> > In scheme's case both code have been excuted in the same time.
>
> > None of clojure code I have seen have inner function.
> > I like inner function because it doesn't consume a name from namespace
> > and make it clear that inner function is only used by outer function.
> > Thanks.
>
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> And what is good, Phaedrus,
> And what is not good—
> Need we ask anyone to tell us these things?
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