(into {} (apply map vector
'((cars bmw chevrolet ford peugeot)
(genres adventure horror mystery))))
{ford mystery, chevrolet horror, bmw adventure, cars genres}
On Mon, May 4, 2009 at 4:03 PM, Michel S. <michel.syl...@gmail.com> wrote:
>
>
>
> On May 4, 5:07 pm, Christophe Grand <christo...@cgrand.net> wrote:
>> Michel S. a écrit :
>>
>> >> (apply conj {} (map split-kv (split-pairs test-str)))
>>
>> > The last can be simplified by using into:
>> > (into {} (map split-kv (split-pairs test-str)))
>>
>> It should be noted that into (and conj) is somewhat tricky with maps:
>> user=> (into {} '({1 2} {3 4}))
>> {3 4, 1 2}
>> user=> (into {} '([1 2] [3 4]))
>> {3 4, 1 2}
>> user=> (into {} '((1 2) (3 4)))
>> java.lang.ClassCastException: java.lang.Integer cannot be cast to
>> java.util.Map$Entry (NO_SOURCE_FILE:0)
>>
>> It bit me before.
>>
> Yes, me too. The design is a bit unfortunate, as I cannot convert a
> Scheme-style association list to a map easily:
>
> user=> (into {} '((cars bmw chevrolet ford peugeot)
> (genres adventure horror mystery)))
>
> java.lang.ClassCastException: clojure.lang.Symbol cannot be cast to
> java.util.Map$Entry (NO_SOURCE_FILE:0)
>
> --
> Michel
> >
>
--
And what is good, Phaedrus,
And what is not good—
Need we ask anyone to tell us these things?
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