I think the exception is thrown because you basically called (every? false
coll) however on my clojure version I cannot reproduce it oh wait there we
go, some bug here with empty collection (maybe someone can pick it up):
=> (every? false [1 2 3])
ClassCastException java.lang.Boolean cannot be cast to clojure.lang.IFn
clojure.core/every? (core.clj:2423)
=> (every? false [])
true
=> *clojure-version*
{:interim true, :major 1, :minor 6, :incremental 0, :qualifier "master"}
On Wed, May 22, 2013 at 7:17 PM, Peter Mancini <peter.manc...@gmail.com>wrote:
> So I did some coding and came up with this but it is broken;
>
> (= java.lang.Boolean (type false)) ;;evaluates to true
>
> (defn all-true?
> [coll]
> (every? (cond (= java.lang.Boolean (type identity)) identity :else
> false) coll)) ;;compiles
>
> (all-true? '(true true true)) ;; throws java.lang.ClassCastException:
> java.lang.Boolean cannot be cast to clojure.lang.IFn
> (all-true? '(true true false))
> (all-true? '(true true 3))
>
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