1 files changed, 19 insertions, 0 deletions
diff --git a/build/es/internal/map.js b/build/es/internal/map.js
new file mode 100644
index 0000000..5057f49
--- /dev/null
+++ b/build/es/internal/map.js
@@ -0,0 +1,19 @@
+'use strict';
+
+import isArrayLike from 'lodash-es/isArrayLike';
+import noop from 'lodash-es/noop';
+import once from 'lodash-es/once';
+
+export default function _asyncMap(eachfn, arr, iterator, callback) {
+    callback = once(callback || noop);
+    arr = arr || [];
+    var results = isArrayLike(arr) ? [] : {};
+    eachfn(arr, function (value, index, callback) {
+        iterator(value, function (err, v) {
+            results[index] = v;
+            callback(err);
+        });
+    }, function (err) {
+        callback(err, results);
+    });
+}