filter 根据一组对象从数组中刷选匹配对象元素的

Question

如下：

let all = [
    {a: 11, b: 88},
    {a: 3, b: 77},
    {a: 6, b: 55},
];
let f = [
    {a: 3},
    {a: 6},
];

let newA = all.filter(item => {
    //怎么实现？
})

筛选出新数组

let newA = [
    {a: 3, b: 77},
    {a: 6, b: 55},
];

Answer 1

let newA = all.filter(item => {
    return f.some(v => v.a === item.a)
})

Answer 2

得先吧f处理一下吧

let list = f.map(item => {
  return item.a
})
let newA = all.filter(item => {
  return list.includes(item.a)
})