30-seconds-of-code/snippets/intersection.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
List intersection	list	blog_images/wooden-bowl.jpg	2019-08-20T15:14:26+03:00	2020-11-02T19:28:05+02:00

Returns a list of elements that exist in both lists.

• Create a set from a and b.
• Use the built-in set operator & to only keep values contained in both sets, then transform the set back into a list.

def intersection(a, b):
  _a, _b = set(a), set(b)
  return list(_a & _b)

intersection([1, 2, 3], [4, 3, 2]) # [2, 3]