数组并交差集

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现有两数组a = [1, 2, 3]，b = [2, 4, 5]，求a，b数组的并集，交集和差集

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// 并集
let union = a.concat(b.filter(v => !a.includes(v)));
// [1,2,3,4,5]

// 交集
let intersection = a.filter(v => b.includes(v));
// [2]

// 差集
let difference = a.concat(b).filter(v => !a.includes(v) || !b.includes(v));
// [1,3,4,5]


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// 交集
[[1, 2, 3], [1, 3, 5], [6, 8, 1]].reduce((x, y) => {
    return x.filter(el => y.includes(el));
});
// [1]