javascript - 如何根据javascript中的键合并和替换两个数组中的对象？

Question

我有两个数组对象(arrayList1、arrayList2)。只是我试图将这两个数组合并到一个数组对象中。 我使用了以下术语。

• 根据键名类型将两个数组合并为一个数组。
• arrayList2 的值将覆盖 arrayList1。
• 我得到了预期的输出，但我担心如何使用高效和性能的方式..

谁能简化我的代码..

注意:

• 如果使用 Array.reduce 函数而不使用任何插件/库，那就太好了。
• 我添加了 smaple 输入以供理解。元素顺序将发生变化，两个数组的大小也将发生变化。

const arrayList1 = [
    { type: "A", any: 11, other: "ab", props: "1" },
    { type: "B", any: 22, other: "bc", props: "2" }, // same type
    { type: "C", any: 33, other: "df", props: "3" }
];
 
const arrayList2 = [
    { type: "D", any: 44, other: "aa", props: "11" },
    { type: "B", any: 22, other: "bb", props: "2----2" , x: 10}, // same type
    { type: "E", any: 44, other: "cc", props: "33" }
];

result = arrayList2.reduce(function (arr1, arr2) {
  let isMatchFound = false;
  arr1.forEach(function (list) {
    if (arr2.type == list.type) {
      list = Object.assign(list, arr2);
      isMatchFound = true;
    }
  });
  if (!isMatchFound) {
    arr1.push(arr2);
  }
  return arr1;
}, arrayList1);

console.log('result', JSON.stringify(result));

Answer 1

您还可以使用 .reduce() 和 Object.values() 方法来获得所需的输出:

const arrayList1 = [
    { type: "A", any: 11, other: "ab", props: "1" },
    { type: "B", any: 22, other: "bc", props: "2" }, // same type
    { type: "C", any: 33, other: "df", props: "3" }
];
 
const arrayList2 = [
    { type: "D", any: 44, other: "aa", props: "11" },
    { type: "B", any: 22, other: "bb", props: "2----2" , x: 10}, // same type
    { type: "E", any: 44, other: "cc", props: "33" }
];

const result = Object.values(
   [].concat(arrayList1, arrayList2)
     .reduce((r, c) => (r[c.type] = Object.assign((r[c.type] || {}), c), r), {})
);
                 
console.log(result);

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