An empty sequence is equal to nil.
2012/8/29 Ambrose Bonnaire-Sergeant <abonnaireserge...@gmail.com>:
> My guess is that `merge` has an invariant "if all args are nil, return nil",
> making calls to `seq` "contagious" from args to return value.
>
> => (merge (seq {}) (seq {}))
> nil
>
> Just a guess though.
>
> Thanks,
> Ambrose
>
> On Thu, Aug 30, 2012 at 12:18 AM, Brian Marick <mar...@exampler.com> wrote:
>>
>> Why does `(merge)` return nil? I would have expected it to return the unit
>> ({}) by analogy with things like this:
>>
>> (+) => 0
>> (*) => 1
>>
>> -----
>> Brian Marick, Artisanal Labrador
>> Contract programming in Ruby and Clojure
>> Occasional consulting on Agile
>>
>>
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