On Thu, Nov 6, 2008 at 8:25 AM, Chanwoo Yoo <[EMAIL PROTECTED]> wrote:
>
> Hi all. In Stuart's book - Programming Clojure, there is a multi
> method like following:
>
> (defmulti blank? class)
> (defmethod blank? String [s] (every? #{\space} s))
> (defmethod blank? nil [_] true)
>
> After reading the method, I was curious about type or class of native
> data structures of Clojure. So I typed next code in slime. Hmm.. I
> didn't understand why classes of {:a 1} and {} are not same. Like
> Stuart's code, to make multi method branching based on clojure data
> structure type(map, vector, list), what symbol should I use? (Like
> String for "string", Is there a Map for {:a 1}? I tried
> PersistentHashMap, HashMap, Map, so on.. I didn't find it.)
I think what you're looking for is "clojure.lang.PersistentHashMap"
instead of just "PersistentHashMap".
user=> String
java.lang.String
user=> PersistentHashMap
java.lang.Exception: Unable to resolve symbol: PersistentHashMap in this context
[...]
user=> clojure.lang.PersistentHashMap
clojure.lang.PersistentHashMap
user=>
I don't know much about Clojure, though, so I suspect there is better
advice than the above :)
> user> (= (class "abc") String)
> true
> user> (class {:a 1 :b 2})
> #=clojure.lang.PersistentHashMap
> user> (class {})
> #=clojure.lang.PersistentHashMap
> user> (= (class {:a 1}) (class {}))
> false
> user> (= (class {:a 1}) (class {:b 2}))
> true
That seems rather strange to me too.
--
Michael Wood <[EMAIL PROTECTED]>
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