added DoWithError and Clone methods

map.go

@@ -101,3 +101,24 @@ func (m *Map[K, V]) Do(f func(m map[K]V)) {
 	defer m.mutex.Unlock()
 	f(m.data)
 }
+
+// DoWithError calls f with the underlying primitive map and returns its error.
+// Be aware that this locks m for write access
+// so Do can be used for reading as well as modifiying m.
+func (m *Map[K, V]) DoWithError(f func(m map[K]V) error) error {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	return f(m.data)
+}
+
+// Clone returns a copy of the underlying map data
+func (m *Map[K, V]) Clone() map[K]V {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	c := map[K]V{}
+	for key, value := range m.data {
+		c[key] = value
+	}
+	return c
+}