es-toolkit/docs/reference/array/union.md

union

Creates an array of unique values from all given arrays.

This function takes two arrays, merges them into a single array, and returns a new array containing only the unique values from the merged array.

Signature

function union<T>(arr1: T[], arr2: T[]): T[];

Parameters

• arr1 (T[]): The first array to merge and filter for unique values.
• arr2 (T[]): The second array to merge and filter for unique values.

Returns

(T[]): A new array of unique values.

Examples

const array1 = [1, 2, 3];
const array2 = [3, 4, 5];
const result = union(array1, array2);
// result will be [1, 2, 3, 4, 5]