Add extend() method to ResultSet

src/cocoviz/result.py

@@ -237,6 +237,17 @@ def append(self, result: Result) -> ResultSet:
         self._results.append(result)
         return self
 
+    def extend(self, results: Sequence[Result]):
+        """Extend a ResultSet with a sequence of `Result`s or another `ResultSetǹ.
+
+        Parameters
+        ----------
+        results: Sequence[Result] or Resultset:
+            Results to add to this result set.
+        """
+        for result in results:
+            self.append(result)
+
     def filter(self, function: Callable[[Result], bool]) -> ResultSet:
         """Return a ResultSet containing the results for which `function` returns `True`