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

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Array union	array	beginner	blog_images/yellow-white-mug-2.jpg	2017-12-17T16:41:31+02:00	2020-10-22T20:24:44+03:00

Returns every element that exists in any of the two arrays at least once.

• Create a Set with all values of a and b and convert it to an array.

const union = (a, b) => Array.from(new Set([...a, ...b]));

union([1, 2, 3], [4, 3, 2]); // [1, 2, 3, 4]