diff --git a/dataext/syncMap.go b/dataext/syncMap.go
index ecf6b8a..541944b 100644
--- a/dataext/syncMap.go
+++ b/dataext/syncMap.go
@@ -35,6 +35,23 @@ func (s *SyncMap[TKey, TData]) SetIfNotContains(key TKey, data TData) bool {
 	return true
 }
 
+func (s *SyncMap[TKey, TData]) SetIfNotContainsFunc(key TKey, data func() TData) bool {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if _, existsInPreState := s.data[key]; existsInPreState {
+		return false
+	}
+
+	s.data[key] = data()
+
+	return true
+}
+
 func (s *SyncMap[TKey, TData]) Get(key TKey) (TData, bool) {
 	s.lock.Lock()
 	defer s.lock.Unlock()
@@ -66,6 +83,23 @@ func (s *SyncMap[TKey, TData]) GetAndSetIfNotContains(key TKey, data TData) TDat
 	}
 }
 
+func (s *SyncMap[TKey, TData]) GetAndSetIfNotContainsFunc(key TKey, data func() TData) TData {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if s.data == nil {
+		s.data = make(map[TKey]TData)
+	}
+
+	if v, ok := s.data[key]; ok {
+		return v
+	} else {
+		dataObj := data()
+		s.data[key] = dataObj
+		return dataObj
+	}
+}
+
 func (s *SyncMap[TKey, TData]) Delete(key TKey) bool {
 	s.lock.Lock()
 	defer s.lock.Unlock()
diff --git a/goextVersion.go b/goextVersion.go
index c2fac30..b276897 100644
--- a/goextVersion.go
+++ b/goextVersion.go
@@ -1,5 +1,5 @@
 package goext
 
-const GoextVersion = "0.0.446"
+const GoextVersion = "0.0.447"
 
-const GoextVersionTimestamp = "2024-05-10T21:31:36+0200"
+const GoextVersionTimestamp = "2024-05-10T21:33:01+0200"