primeiro commit com exercicios de Exercism realizados até esta data

python/list-ops/list_ops.py

@@ -0,0 +1,73 @@
+from typing import Callable
+
+
+# return the length of list
+def length(list: list) -> int:
+    length: int = 0
+    for _ in list:
+        length += 1
+    return length
+
+
+# append list2 at the end of list1
+def append(list1: list, list2: list) -> list:
+    new_list: list = []
+    for index, item in enumerate(list1, 0):
+        new_list.insert(index, item)
+    for index, item in enumerate(list2, length(list1)):
+        new_list.insert(index, item)
+    return new_list
+
+
+def concat(lists: list[list]):
+    new_list: list = []
+    for item_list in lists:
+        new_list = append(new_list, item_list)
+    return new_list
+
+
+def filter(function: Callable, list_of_items: list):
+    filtered_list: list = []
+    insert_index: int = 0
+    for item in list_of_items:
+        if function(item):
+            filtered_list.insert(insert_index, item)
+            insert_index += 1
+    return filtered_list
+
+
+def map(function, list_of_items):
+    mapped_list: list = []
+    for index, item in enumerate(list_of_items):
+        mapped_list.insert(index, function(item))
+    return mapped_list
+
+
+def foldl(
+    function: Callable, list_of_items: list[int | str], initial: int | str
+) -> int | str:
+    result: int | str = initial
+    if len(list_of_items) == 0:
+        return result
+    for index in range(0, len(list_of_items)):
+        result = function(result, list_of_items[index])
+    return result
+
+
+def foldr(function: Callable, list_of_items: list, initial: int | str) -> int | str:
+    result: int | str = initial
+    if len(list_of_items) == 0:
+        return result
+    for index in range(len(list_of_items) - 1, -1, -1):
+        result = function(result, list_of_items[index])
+    return result
+
+
+# reverse the order of the elements in the list
+def reverse(list_of_items: list) -> list:
+    # not doing this
+    # return list[::-1]
+    reversed_list: list = []
+    for item in list_of_items:
+        reversed_list.insert(0, item)
+    return reversed_list