Add all_equal snippet

snippets/all_equal.md

@@ -0,0 +1,18 @@
+---
+title: function_name
+tags: list,beginner
+---
+
+Check if all elements in a list are equal.
+
+Use `[1:]` and `[:-1]` to compare all the values in the given list.
+
+```py
+def all_equal(lst):
+  return lst[1:] == lst[:-1]
+```
+
+```py
+all_equal([1, 2, 3, 4, 5, 6]) # False
+all_equal([1, 1, 1, 1]) # True
+```