兩個陣列的並集、交集、差集
阿新 • • 發佈：2018-12-31
const arr1 = [1,2,3];
const arr2 = [3,4,5];
// 並集
const union = Array.from(new Set([...arr1,...arr2])); // union = [1,2,3,4,5]
// 交集
const intersection = Array.from(new Set([...arr1].filter(x => new Set(arr2).has(x)))); // intersection = [3]
// 差集
const difference1 = Array.from(new Set([...arr1].filter(x => !new Set(arr2).has(x)))); // difference1 = [1,2]
const difference2= Array.from(new Set([...arr2].filter(x => !new Set(arr1).has(x)))); // difference2 = [4,5]