1 files changed, 40 insertions, 0 deletions
diff --git a/lib/eachOfSeries.js b/lib/eachOfSeries.js
new file mode 100644
index 0000000..bcfa029
--- /dev/null
+++ b/lib/eachOfSeries.js
@@ -0,0 +1,40 @@
+'use strict';
+
+import once from 'lodash/once';
+import noop from 'lodash/noop';
+
+import keyIterator from './internal/keyIterator';
+import onlyOnce from './internal/onlyOnce';
+import setImmediate from './setImmediate';
+
+export default function eachOfSeries(obj, iterator, callback) {
+    callback = once(callback || noop);
+    obj = obj || [];
+    var nextKey = keyIterator(obj);
+    var key = nextKey();
+
+    function iterate() {
+        var sync = true;
+        if (key === null) {
+            return callback(null);
+        }
+        iterator(obj[key], key, onlyOnce(function(err) {
+            if (err) {
+                callback(err);
+            } else {
+                key = nextKey();
+                if (key === null) {
+                    return callback(null);
+                } else {
+                    if (sync) {
+                        setImmediate(iterate);
+                    } else {
+                        iterate();
+                    }
+                }
+            }
+        }));
+        sync = false;
+    }
+    iterate();
+}