Add intersection snippet

snippets/difference.md

@@ -5,7 +5,7 @@ tags: list,beginner
 
 Returns the difference between two iterables.
 
-Create a `set` fromn `b`, then use list comprehension on `a` to only keep values not contained in the previously created set, `_b`.
+Create a `set` from `b`, then use list comprehension on `a` to only keep values not contained in the previously created set, `_b`.
 
 ```py
 def difference(a, b):

snippets/intersection.md

@@ -0,0 +1,18 @@
+---
+title: intersection
+tags: list,beginner
+---
+
+Returns a list of elements that exist in both lists.
+
+Create a `set` from `b`, then use list comprehension on `a` to only keep values contained in both lists.
+
+```py
+def intersection(a, b):
+  _b = set(b)
+  return [item for item in a if item in _b]
+```
+
+```py
+intersection([1, 2, 3], [4, 3, 2]) # [2, 3]
+```