add autopaging directive

1 files changed, 19 insertions, 0 deletions

diff --git a/js/utility/Iterators.js b/js/utility/Iterators.js
index 3c5e34b18..1f96aab71 100644
--- a/js/utility/Iterators.js
+++ b/js/utility/Iterators.js
@@ -48,4 +48,23 @@ window.enumerate = function (list) {
             })();
         }
     };
+};
+
+
+/**
+ * Iterates over a list in reverse
+ * like: for (let value of reverse(list))
+ */
+window.reverse = function (list) {
+    'use strict';
+
+    return {
+        [Symbol.iterator]: function () {
+            return (function*() {
+                for (let counter = list.length; counter >= 0 ; counter -= 1) {
+                    yield list[counter];
+                }
+            })();
+        }
+    };
 };
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