Add for_each and for_each_right

for_each.md

@@ -0,0 +1,18 @@
+---
+title: for_each
+tags: list,beginner
+---
+
+Executes the provided function once for each list element.
+
+Use a `for` loop to execute `fn` for each element in `itr`.
+
+```py
+def for_each(itr, fn):
+  for el in itr:
+    fn(el)
+```
+
+```py
+for_each([1, 2, 3], print)  # 1 2 3
+```

for_each_right.md

@@ -0,0 +1,18 @@
+---
+title: for_each_right
+tags: list,beginner
+---
+
+Executes the provided function once for each list element, starting from the list's last element.
+
+Use a `for` loop in combination with slice notation to execute `fn` for each element in `itr`, starting from the last one.
+
+```py
+def for_each_right(itr, fn):
+  for el in itr[::-1]:
+    fn(el)
+```
+
+```py
+for_each_right([1, 2, 3], print)  # 3 2 1
+```