On Sun, Jan 11, 2009 at 9:12 PM, Mark Triggs <mark.h.tri...@gmail.com> wrote:
>
> I've also found this useful for accessing members in nested maps. For
> example:
>
> (let [me {:person {:name {:first "Mark"
> :last "Triggs"}
> :email "mark.h.tri...@gmail.com"}}]
> (-> me :person :name :first))
>
> => "Mark"
>
> On Jan 12, 1:04 pm, kkw <kevin.k....@gmail.com> wrote:
>> One use I've found for -> (though there are others I haven't come to
>> appreciate yet) is when I have something like:
>> (f1 (f2 (f3 (f4 x))))
>>
>> which can be re-written as
>> (-> x f4 f3 f2 f1)
>>
>> I find the latter expression easier to read.
>>
>> Kev
>>
>> On Dec 30 2008, 2:49 pm, wubbie <sunj...@gmail.com> wrote:
>>
>> > Very criptic for newbie.
>> > What does "Threads the expr through the forms." mean?
>> > Does it create a thread to execute?
>>
>> > thanks
>> > sun
>>
>> > On Dec 29, 10:07 pm, Paul Barry <pauljbar...@gmail.com> wrote:
>>
>> > > You can look up the documentation for a function/macro interactively
>> > > from the repl:
>>
>> > > user=> (doc ->)
>> > > -------------------------
>> > > clojure.core/->
>> > > ([x form] [x form & more])
>> > > Macro
>> > > Threads the expr through the forms. Inserts x as the
>> > > second item in the first form, making a list of it if it is not a
>> > > list already. If there are more forms, inserts the first form as the
>> > > second item in second form, etc.
>> > > nil
>>
>> > > On Dec 29, 8:27 pm, wubbie <sunj...@gmail.com> wrote:
>>
>> > > > Hi all,
>>
>> > > > Looking intoants.clj, I came across
>> > > > (defn place [[x y]]
>> > > > (-> world (nth x) (nth y)))
>>
>> > > > What -> mean here?
>>
>> > > > thanks
>> > > > sun
I initially stumbled on what -> is good for. But over time it makes
more sense. I like to think of it as similar to this construct, which
you often see in the Java world:
Object result = object.doSomething().doSomethingElse().andMoreThings();
Of course the doSomethings could also be get*s() or what-have-you.
/mike.
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