1 files changed, 2 insertions, 1 deletions
diff --git a/lib/async.js b/lib/async.js
index 9c2b6af..208e602 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -353,7 +353,8 @@
 
     function _asyncMap(eachfn, arr, iterator, callback) {
         callback = _once(callback || noop);
-        var results = [];
+        arr = arr || [];
+        var results = _isArrayLike(arr) ? [] : {};
         eachfn(arr, function (value, index, callback) {
             iterator(value, function (err, v) {
                 results[index] = v;