What is union of Arrays?

Union of arrays would represent a new array combining all elements of the input arrays, without repetition of elements.

let arrOne = [10,15,22,80];let arrTwo = [5,10,11,22,70,90];// Union of Arrayslet arrUnion = [...new Set([...arrOne, ...arrTwo])];console.log(arrUnion);

What is intersection of Arrays?

The intersection of two arrays is a list of distinct numbers which are present in both the arrays. The numbers in the intersection can be in any order.

let arrOne = [10,15,22,80];let arrTwo = [5,10,11,22,70,90];// Intersection of Arrayslet arrIntersection = arrOne.filter((v) =>{    return arrTwo.includes(v);});console.log(arrIntersection);

Demo -