如何基于javascript中的键合并和替换两个数组中的对象? [英] How to merge and replace objects from two arrays based on a key in javascript?

问题描述

我有两个数组对象(arrayList1，arrayList2).我只是想将这两个数组合并为一个数组对象. 我使用了以下术语.

I have two array object(arrayList1,arrayList2). Just I am trying to merge those two arrays into one array object. The following terms I used.

• 两个基于键名合并为一个数组的数组都是 type .
• arrayList2的值将覆盖arrayList1.
• 我获得了预期的输出，但是我想用高效和高性能的方式来做..

有人可以简化我的代码吗?.

Can someone please simplify my code..

注意:

• 如果使用Array.reduce函数并且不使用任何插件/库，那就太好了.
• 我添加了smaple输入以进行理解.元素顺序将改变，两个数组的大小也会改变.

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));

推荐答案

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

You may also use .reduce() and Object.values() methods to get the desired output:

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);

.as-console-wrapper { max-height: 100% !important; top: 0; }

这篇关于如何基于javascript中的键合并和替换两个数组中的对象?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！