依照id替换对象属性的值

Question

var data = [{
    price: 1,
    name: 'qq',
    id: 'a2321'
  },
  {
    price: 2,
    name: 'ww',
    id: 'a6666'
  }
]

var newData = [{
    price: 100,
    id: 'a2321'
  },
  {
    price: 200,
    id: 'a6666'
  }
]

data.forEach((o, i) => Object.assign(o, newData[i]));

console.log(data);

程序长这样

用Object.assign去替换data的price

但我想要严谨一点，用id去判断，先比对id相同的话，再替换他的price

这该怎么做呢

Answer 1

奖newData转换成map类型就好做了，不用比较id

    var data = [{
        price: 1,
        name: 'qq',
        id: 'a2321'
      },
      {
        price: 2,
        name: 'ww',
        id: 'a6666'
      }
    ]
    
    var newData = [{
        price: 100,
        id: 'a2321'
      },
      {
        price: 200,
        id: 'a6666'
      }
    ]
    const map = {}
    newData.forEach(item => map[id] = item) // 转换map类型，key为id
    data.map((o, i) => {
        return {
            ...o,
            ...(map[o.id] || {})
        }
    });

    console.log(data);

还有一种方式, 比较id。这种会在map走一遍循环

    data.map((o, i) => {
        const record = newData.find(item => item.id === o.id)
        return {
            ...o,
            ...(record || {})
        }
    });