javascript - 如何使用另一个 JS 数组替换 JS 数组属性值

Question

我想使用另一个 JS 数组替换 JS 数组属性值。我解释如下。

const arr1 = [
{
  code: "XXY",
  dis: "cont1",
  note: "Note for cont1"
}, 
{
  code: "AAW",
  dis: "cont2",
  note: "Note for cont2"
}, 
{
  code: "TTR",
  dis: "cont5",
  note: "Note for cont5"
}, 
{
  code: "MMN",
  dis: "cont10",
  note: "Note for cont10"
}]

const new_array = [
  {
    "code": "AAW",
    "dis": "cont2 new",
    "note": "Note for cont2"
  },
  {
    "code": "TTR",
    "dis": "cont5",
    "note": "New Note for cont5"
  }]

预期输出:

[
 {
  code: "XXY",
  dis: "cont1",
  note: "Note for cont1"
 }, 
 {
  code: "AAW",
  dis: "cont2 new",
  note: "Note for cont2"
 }, 
 {
  code: "TTR",
  dis: "cont5",
  note: "New Note for cont5"
 }, 
 {
  code: "MMN",
  dis: "cont10",
  note: "Note for cont10"
 }
]

我们需要检查所有 arr1元素等于 new_arr.code至 arr1.code并比较 dis和 note特性。如 arr1.dis不等于 new_arr.dis然后 arr1.dis值应替换为 new_arr.dis .这与 note 相同属性(property)也。
试过的代码:

arr1.forEach(function(item1) {
        var item2 = arr1.find(function (item2) {
            return arr1.code === new_array.code;
        });
    })

console.log(arr1);

电流输出:

[
  {
    "code": "XXY",
    "dis": "cont1",
    "note": "Note for cont1"
  },
  {
    "code": "AAW",
    "dis": "cont2",
    "note": "Note for cont2"
  },
  {
    "code": "TTR",
    "dis": "cont5",
    "note": "Note for cont5"
  },
  {
    "code": "MMN",
    "dis": "cont10",
    "note": "Note for cont10"
  }
]

我该如何解决这个问题？

Answer 1

new_array.forEach(o1 => { // for every replacement object
  // find the corresponding object in the original array
  const found = arr1.find(o2 => o2.code === o1.code); 
  // if there is a corresponding object
  if (found) {
    // copy its properties over
    found.dis = o1.dis;
    found.note = o1.note;
  }
})

注意这里有一个很差的 O(n^2)时间复杂度，如果您有一个大型数据集，请考虑使用其他答案推荐的集合进行更快的查找。