I don't think the function passed to "some" should be called a
predicate, since it is not constrained to true/false. The docstring
agrees with you, however.
Stuart
> Hi,
>
> It means that some of the maps can be nil, but at least one of them
> has to be non-nil. "some" requires a predicate, but since nil is
> logical false, we can just use "identity". Here's the behavior:
>
> user> (merge nil nil nil)
> nil
> user> (merge {:a 1} nil {:b 2})
> {:b 2, :a 1}
>
> -Stuart Sierra
>
>
> On Jan 22, 7:16 pm, wubbie <sunj...@gmail.com> wrote:
>> Hi,
>>
>> Here is def of merge:
>>
>> (defn merge
>>
>> [& maps]
>> (when (some identity maps)
>> (reduce #(conj (or %1 {}) %2) maps)))
>>
>> How can I interpret when (some identity maps)?
>>
>> Thanks
>> -sun
> >
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