Thanks so much Ambrose! I know that function is simple, but I don't
understand how it provides the functionality I'm after. Do you mind
explaining what's going on? I'm playing with it now in my repl.
Thanks!!
On Friday, July 25, 2014 6:48:06 PM UTC-4, Ambrose Bonnaire-Sergeant wrote:
>
> Hi Geoff,
>
> You probably want a sorted-map-by:
>
> user=> (sorted-map-by (fn [a b] (or (when (every? coll? [a b]) (when (= a
> (reverse b)) 0)) -1)) [1 2] 42 [2 1] 42)
> {[1 2] 42}
>
> Thanks,
> Ambrose
>
>
> On Fri, Jul 25, 2014 at 9:52 AM, Geoff Little <fifo...@gmail.com
> <javascript:>> wrote:
>
>> I'm attempting to proxy PersistentHashmap so that "get"ting an existing
>> key or its reverse returns the same value.
>>
>> Here's the code that I have
>>
>> (defn sym-key-hash-map []
>> (proxy [clojure.lang.PersistentHashMap] [nil 0 nil false nil]
>> (valAt [key]
>> (or (proxy-super valAt key)
>> (proxy-super valAt (reverse key))))))
>>
>> (let [key (list 1 2)]
>> (get (assoc (sym-key-hash-map) key "sweet")
>> (reverse key)))
>>
>> But unfortunately, the test code returns nil instead of "sweet".
>>
>> Does anyone with knowledge of proxy and PersistentHashmap know how to
>> solve this?
>>
>> Thanks.
>>
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