js比较前后两个数组对象的差异

比较前后两个数组对象的差异

js比较前后两个数组对象的差异，比如是添加了什么数据或者删除了什么数据。

// 两个数组对象中有相同的键如 id
// 其中, oldData为初始数据, newData为当前数据
const getChangeData = (oldData, newData) => {
  let delData = oldData.filter(
    (item2) => !newData.some((item1) => item2?.id === item1?.id)
  );
  let addData = newData.filter(
    (item2) => !oldData.some((item1) => item2?.id === item1?.id)
  );
  let changeData = {
    delData,
    addData,
  };
  return changeData;

let data01 = [
  {
    id: 1,
    type: "直尺",
    price: 2,
  },
  {
    id: 2,
    type: "直尺",
    price: 3,
  },
  {
    id: 3,
    type: "直尺",
    price: 4,
  },
  {
    id: 4,
    type: "直尺",
    price: 5,
  },
];
let data02 = [
  {
    id: 2,
    type: "直尺",
    price: 3,
  },
  {
    id: 5,
    type: "文具盒",
    price: 10,
  },
  {
    id: 6,
    type: "铅笔",
    price: 2,
  },
];
}
const a = getChangeData(data01, data02);
console.log(a);

输出： { delData: [ { id: 1, type: '直尺', price: 2 }, { id: 3, type: '直尺', price: 4 }, { id: 4, type: '直尺', price: 5 } ], addData: [ { id: 5, type: '文具盒', price: 10 }, { id: 6, type: '铅笔', price: 2 } ] }