What does `empty` do for non-collection types?:
(empty 1) => nil
(empty "123") => nil
(empty :abc) => nil
(empty (clojure.lang.MapEntry. "a" 1))
So it is actually very consistent.
On Fri, Jul 18, 2014 at 6:06 PM, Brian Craft <craft.br...@gmail.com> wrote:
> hm, looks even more broken in the context of these examples.
>
>
> On Friday, July 18, 2014 5:04:34 AM UTC-7, Mike Fikes wrote:
>>
>> My guess: Perhaps this is a bug, or alternatively, a known issue that
>> won't be addressed because to do so would be a breaking change.
>>
>> There is an old demo of Clojure given by Rich where MapEntry's were
>> printed using some sort of un-readable notation #<:foo 5>. But clearly
>> MapEntry's have been revised to act a lot like 2-element vectors.
>>
>> user=> (rseq (first (mapv identity {:foo 5})))
>>
>> (5 :foo)
>>
>> user=> (conj (first (mapv identity {:foo 5})) :x)
>>
>> [:foo 5 :x]
>>
>> user=> (assoc (first (mapv identity {:foo 5})) 1 7)
>>
>> [:foo 7]
>>
>> user=> (subvec (first (mapv identity {:foo 5})) 0 1)
>>
>> [:foo]
>>
>>
>> FWIW, ClojureScript behaves in your expected way:
>>
>>
>> (empty (first (mapv identity {:foo 5})))
>>
>> => []
>>
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