On Thu, Jan 5, 2017 at 6:45 AM, Tianxiang Xiong <tianxiang.xi...@gmail.com>
wrote:
> So clearly a check is also made *after* evaluating the key forms. I'm
> just not sure why we need to check *before* evaluating the key forms.
>
Because Clojure is a lisp. Code is data. {(java.util.UUID/randomUUID) 1
(java.util.UUID/randomUUID) 2} is a map that is passed to the compiler for
compilation/evaluation, it's not some special MapASTNode like it would be
possible in heteroiconic languages. However this map has a duplicate key,
so one value should be dropped *because it's a map* before even getting to
the compiler (including macros).
Mark's suggestion (array-map (java.util.UUID/randomUUID) 1
(java.util.UUID/randomUUID) 2) is the way to go.
Or if you want to be hacky:
=> {(java.util.UUID/randomUUID) 1
(do (java.util.UUID/randomUUID)) 2
(do (do (java.util.UUID/randomUUID))) 3}
{#uuid "670a2de7-7a67-4cfb-97c7-cc2c10a8d6f7" 1,
#uuid "88bb875d-7830-4ee3-8a2f-d10075e9226b" 2,
#uuid "e68b01a8-6442-4392-9d34-ff76efa6ae32" 3}
hth,
Christophe
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