diff --git a/jay_diff.py b/jay_diff.py
index e2da394..b95abc2 100644
--- a/jay_diff.py
+++ b/jay_diff.py
@@ -3,28 +3,28 @@ from copy import deepcopy
 
 def jay_diff_rev(_old, _new):
 	delta = {}
-	for k in _old.keys():
-		if k in _new:
-			if isinstance(_old[k], dict):
+	for k in _new.keys():
+		if k in _old:
+			if isinstance(_new[k], dict):
 				res = jay_diff_rev(_old[k], _new[k])
 				if len(res.keys()):
 					delta[k] = res
 		else:
-			_new[k] = _old[k]
-			delta[k] = _old[k]
+			_old[k] = _new[k]
+			delta[k] = _new[k]
 
 	return delta
 
 
 def jay_diff_add(_old, _new):
 	__old = deepcopy(_old)
-	delta = jay_diff_rev(_new, __old)
+	delta = jay_diff_rev(__old, _new)
 	return delta
 
 
 def jay_diff_del(_old, _new):
 	__new = deepcopy(_new)
-	delta = jay_diff_rev(_old, __new)
+	delta = jay_diff_rev(__new, _old)
 	return delta