From d954a62fe9a306ca1750047cf9a4fb8726dc8b7c Mon Sep 17 00:00:00 2001
From: Roman Dmytruk <roman.dmytruk@student.tuke.sk>
Date: Tue, 29 Sep 2026 14:46:37 +0000
Subject: [PATCH] Update u2/list_ops.py

---
 u2/list_ops.py | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/u2/list_ops.py b/u2/list_ops.py
index 72b4ca4..43fcd5f 100644
--- a/u2/list_ops.py
+++ b/u2/list_ops.py
@@ -1,8 +1,4 @@
-def length(l):
-    count = 0
-    for item in l:
-        count +=1
-    return count
+
 
 def append(list1, list2):
     result = []
@@ -12,3 +8,21 @@ def append(list1, list2):
         result += [item]
     return result
 
+def concat(lists):
+    result = []
+    for sublist in lists
+        result = append(result, sublist)
+    return result
+
+def filter(function, list):
+    result = []
+    for item in list:
+        if function(item):
+            result += [item]
+    return result
+
+def length(l):
+    result = 0
+    for item in l:
+        result +=1
+    return result    
\ No newline at end of file