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

title, tags

title	tags
union	array,math,beginner

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

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

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

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