reverse, fixes #61

core.js

@@ -935,3 +935,10 @@ export function keep(pred, coll) {
     }
   });
 }
+
+export function reverse(coll) {
+  if (coll instanceof Array) {
+    // performance: we don't need to copy to another array first
+    return coll.reverse();
+  } else return [...coll].reverse();
+}

resources/clava/core.edn

@@ -74,6 +74,7 @@
   repeat
   reset_BANG_
   rest
+  reverse
   satisfies_QMARK_
   second
   select_keys

test/clava/compiler_test.cljs

@@ -1094,5 +1094,9 @@
   (is (eq (keep #(when (odd? %) (inc %)) [1 2 3])
           (vec (jsv! '(keep #(when (odd? %) (inc %)) [1 2 3]))))))
 
+(deftest reverse-test
+  (is (eq (reverse [1 2 3]) (jsv! '(reverse [1 2 3]))))
+  (is (eq (reverse (range 10)) (jsv! '(reverse (range 10))))))
+
 (defn init []
   (cljs.test/run-tests 'clava.compiler-test 'clava.jsx-test))