es6中如何利用一个对象给另外一个对象赋值？请看下面表述

Question

let arra = {
    'aaa':'',
    'bbb':'',
    'ccc':''
}
let arrb = {
    'aaa':'111',
    'bbb':'222',
    'ccc':'333',
    'ddd':'444',
    'eee':'555'
}
listAssign(arra,arrb)

执行listAssign后，arra变成了

arra = {
    'aaa':'111',
    'bbb':'222',
    'ccc':'333'
}

即，利用B对象给A对象赋了值
请问：这个listAssign应该如何实现？

Answer 1

const listAssign = (arrA, arrB) => Object.keys(arrA).forEach(key => { arrA[key] = arrB[key] || arrA[key]});

Answer 2

function listAssign(arra, arrb){
      let b = {}
      for(let item in arrb) {
        console.log(item)
        if (Object.keys(arra).includes(item)) {
          b[item] = arrb[item]
        }
      }
      return b
    }

Answer 3

for(var key in arra){
    arra[key] = arrb[key]
}

Answer 4

function listAssign(arra, arrb) {
    return Object.keys(arra).forEach(key => {
        if(arrb.hasOwnProperty(key)) {
            arra[key] = arrb[key]
        }
    })
}

Answer 5

Object.assign(a, b)