Common Elements

ARRAY

### Problem

Given two integer arrays, `arr1`

and `arr2`

, return an array of their intersection. Each element in the result must be unique, and the result should be returned in ascending order.

### Examples

`commonElements([3,3,3], [3,3]) // returns [3] // The number 3 appears in both arrays, // so the result is [3]. commonElements([1,7,8,9], [5,6,7,8]) // returns [7,8] // The numbers 7 and 8 are common to both arrays, // and they are returned in ascending order. commonElements([10,11,12], [1,2,3]) // returns [] // There are no common elements between the two arrays, // so an empty array is returned.`

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