Обновить u2/list_ops.py

u2/list_ops.py

@@ -2,6 +2,60 @@ def length(list):
     count = 0
     for item in list:
         count +=1
-        return count
+    return count
+
+        
+def append(list1, list2):
+    result = []
+    for item in list1:
+        result.append(item)
+    for item in list2:
+        result.append(item)
+    return result
+
+
+def concat(lists):
+    result = []
+    for box in lists:
+        for item in box:
+            result.append(item)
+    return result
+
+
+def filter(function, list):
+    result = []
+    for item in list:
+        if function(item):
+            result.append(item)
+    return result
+
+
+def map(function,list):
+    result = []
+    for item in list:
+        result.append(function(item))
+    return result
+
+
+def reverse(list):
+    result = []
+    for item in list:
+        result = item + result
+    return result
+
+
+def foldl(function,list,initial):
+    accamulator = initial
+    for item in list:
+        accamulator = fucntion(accamulator, item)
+    return accamulator
+
+
+def foldr(function,list,initial):
+    return foldl(function,reverse.(list),initial)
+
+
+
+
+
 
-