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 <[email protected]> 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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