From 759cd5bea1bacf26691fa04112af966893815df4 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Tue, 29 Sep 2026 13:51:01 +0200
Subject: [PATCH] u2

---
 u2/list_ops_test.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/u2/list_ops_test.py b/u2/list_ops_test.py
index 7bf6ae5..1a66e31 100644
--- a/u2/list_ops_test.py
+++ b/u2/list_ops_test.py
@@ -7,6 +7,7 @@ def append(list1, list2):
         result.append(element)
     return result
 
+
 def concat(lists):
     result = []
 
@@ -15,3 +16,27 @@ def concat(lists):
             result.append(element)
     return result
 
+
+def filter(function, seq):
+    result = []
+
+    for element in seq:
+        if function(element):
+            result.append(element)
+    return result
+
+
+def lenght(seq):
+    count = 0
+
+    for element in seq:
+        count += 1
+    return count
+
+
+def map(function, seq):
+    result = []
+
+    for element in seq:
+        result.append(function(element))
+    return result