not-every? is a predicate (note the ?)

some is not.

On Thu, Jun 14, 2012 at 11:31 AM, Jacobo Polavieja <
jacobopolavi...@gmail.com> wrote:

> Hi!
>
> I've just started learning Clojure today. I've started reading "Clojure -
> Functional Programming for the JVM" (
> http://java.ociweb.com/mark/clojure/article.html<http://java.ociweb.com/mark/clojure/article.html#Collections>
> ).
>
> Anyway, on the collections part (
> http://java.ociweb.com/mark/clojure/article.html#Collections) it called
> my attention that 'some' returns "nil" instead of "false". The examples
> given (being stooges a vector of Strings) are:
>
> (not-every? #(instance? String %) stooges) ; -> false
> (some #(instance? Number %) stooges) ; -> nil
>
> Is there a reason why (some) doesn't return false also? I've read through
> the doc but as I supposed, there's no explanation about the reasoning
> behind it.
>
> Thanks!
>
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