数组对象 级别 交集

有以下数据：
 let a = new Set([
    {
        'categoryId': 1,
        'categoryIdLevelOne': 750611334,
        'categoryIdLevelThree': 750611336,
        'categoryIdLevelTwo': 750611335,
        'id': 2697,
        'level': 3,
        'shopId': 12430,
        'skipLayoutFlag': false,
        'status': 1
    },
    {
        'categoryId': 2,
        'categoryIdLevelOne': 750611472,
        'categoryIdLevelTwo': 750611473,
        'id': 2701,
        'level': 2,
        'shopId': 12430,
        'skipLayoutFlag': false,
        'status': 2
    },
    {
        'categoryId': 3,
        'categoryIdLevelOne': 750611487,
        'categoryIdLevelTwo': 750611488,
        'id': 2702,
        'level': 2,
        'shopId': 12430,
        'skipLayoutFlag': false,
        'status': 1
    }
])
let b = new Set([
    {
        'categoryId': 2,
        'categoryIdLevelOne': 750611334,
        'categoryIdLevelThree': 750611336,
        'categoryIdLevelTwo': 750611335,
        'id': 2697,
        'level': 3,
        'shopId': 12430,
        'skipLayoutFlag': false,
        'status': 1
    },
    {
        'categoryId': 3,
        'categoryIdLevelOne': 750611472,
        'categoryIdLevelTwo': 750611473,
        'id': 2701,
        'level': 2,
        'shopId': 12430,
        'skipLayoutFlag': false,
        'status': 2
    },
    {
        'categoryId': 4,
        'categoryIdLevelOne': 750611487,
        'categoryIdLevelTwo': 750611488,
        'id': 2702,
        'level': 2,
        'shopId': 12430,
        'skipLayoutFlag': false,
        'status': 1
    }
])

交集
[...a].filter(x => [...b].some(y => y.categoryId === x.categoryId))

//或者

Array.from(a).filter(x => Array.from(b).some(y => y.categoryId === x.categoryId))

差集

[...a].filter(x => [...b].every(y => y.categoryId !== x.categoryId))

去重

 this.selectTable = this.selectTable.reduce(function(item, next) {
        hash[next.id] ? "" : (hash[next.id] = true && item.push(next));
        return item;
      }, []);