[JavaScript] 배열 합집합, 교집합 반환 / Set, filter, include

 

 

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합집합

const arrA = [1, 4, 3, 2]; 
const arrB = [5, 2, 6, 7, 1];

const result = [...new Set([...arrA, ...arrB])]; // [1, 4, 3, 2, 5, 6, 7]

 

 

교집합

const arrA = [1, 4, 3, 2]; 
const arrB = [5, 2, 6, 7, 1];

const result = arrA.filter(it => arrB.includes(it)); // [1, 2]