1 files changed, 34 insertions, 0 deletions
diff --git a/lib/eachOf.js b/lib/eachOf.js
new file mode 100644
index 0000000..c370bbb
--- /dev/null
+++ b/lib/eachOf.js
@@ -0,0 +1,34 @@
+'use strict';
+
+import once from 'lodash/once';
+import noop from 'lodash/noop';
+
+import keyIterator from './internal/keyIterator';
+import onlyOnce from './internal/onlyOnce';
+
+export default function eachOf(object, iterator, callback) {
+    callback = once(callback || noop);
+    object = object || [];
+
+    var iter = keyIterator(object);
+    var key, completed = 0;
+
+    while ((key = iter()) != null) {
+        completed += 1;
+        iterator(object[key], key, onlyOnce(done));
+    }
+
+    if (completed === 0) callback(null);
+
+    function done(err) {
+        completed--;
+        if (err) {
+            callback(err);
+        }
+        // Check key is null in case iterator isn't exhausted
+        // and done resolved synchronously.
+        else if (key === null && completed <= 0) {
+            callback(null);
+        }
+    }
+}