Changes for clojure.core/keep-indexed

SoniaH on Wed, 16 May 2012
user=> (keep-indexed #(if (odd? %1) %2) [:a :b :c :d :e])
(:b :d)
jafingerhut on Wed, 28 Mar 2012
user=> (keep-indexed #(if (odd? %1) %2) (range 0 10))
(1 3 5 7 9)
pkolloch on Fri, 20 Aug 2010
user=> (keep-indexed #(if (odd? %1) %2) (range 0 10))
(1 3 5 7 9)