CLJS-1239: Make eduction variadic.

Author: brandonbloom

src/cljs/cljs/core.cljs

@@ -8944,11 +8944,13 @@ reduces them without incurring seq initialization"
 (es6-iterable Eduction)
 
 (defn eduction
-  "Returns a reducible/iterable/seqable application of
-  the transducer to the items in coll. Note that these applications	
-  will be performed every time iterator/seq/reduce is called."
-  [xform coll]
-  (Eduction. xform coll))
+  "Returns a reducible/iterable application of the transducers
+  to the items in coll. Transducers are applied in order as if
+  combined with comp. Note that these applications will be
+  performed every time reduce/iterator is called."
+  {:arglists '([xform* coll])}
+  [& xforms]
+  (Eduction. (apply comp (butlast xforms)) (last xforms)))
 
 (defn run!
   "Runs the supplied procedure (via reduce), for purposes of side

test/cljs/cljs/core_test.cljs

@@ -1369,6 +1369,7 @@
     (is (= (sequence (mapcat reverse) [[3 2 1 0] [6 5 4] [9 8 7]])
           (range 10)))
     (is (= (seq (eduction (map inc) [1 2 3])) '(2 3 4)))
+    (is (= (seq (eduction (map inc) (map inc) [1 2 3])) '(3 4 5)))
     (is (= (sequence (partition-by #{:split}) [1 2 3 :split 4 5 6])
           '([1 2 3] [:split] [4 5 6])))
     (is (= (sequence (partition-all 3) '(1 2 3 4 5))