diff --git a/u3/flatten_array.py b/u3/flatten_array.py
new file mode 100644
index 0000000..288847a
--- /dev/null
+++ b/u3/flatten_array.py
@@ -0,0 +1,10 @@
+def flatten(iterable):
+    result = []
+
+    for item in iterable:
+        if isinstance(item, list):
+            result.extend(flatten(item))
+        elif item is not None:
+            result.append(item)
+
+    return result