如何从javascript中的对象数组映射多个属性 [英] how to map more than one property from array of object in javascript

问题描述

我有一个对象数组，如下所示:

var obj = [{a: 1, b: 5, c: 9},{a: 2, b: 6, c: 10},{a: 3, b: 7, c: 11},{a: 4, b: 8, c: 12}];

我知道如何像这样使用 Array.map() 获取单个对象.

var 结果 = obj.map(x=>x.a)

这会给我以下结果

[1, 2, 3, 4]

但我想要如下结果:

<预><代码>[{a: 1, b: 5},{a: 2, b: 6},{a: 3, b: 7},{a: 4, b: 8}]

简而言之，从对象数组中我只想选择几个字段(多个)

怎么做?

解决方案

您可以将 .map() 与 对象解构:

let data = [{a:1,b:5,c:9}, {a:2,b:6,c:10},{a:3,b:7,c:11}, {a:4,b:8,c:12}];let result = data.map(({ a, b }) => ({a, b}));console.log(result);

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

I have an array of Object as follows:

var obj = [
  {a: 1, b: 5, c: 9},
  {a: 2, b: 6, c: 10},
  {a: 3, b: 7, c: 11},
  {a: 4, b: 8, c: 12}
];

I know about how to get single object using Array.map() like this.

var result = obj.map(x=>x.a)

This will give me following result

[1, 2, 3, 4]

But I want result like follows:

[
  {a: 1, b: 5},
  {a: 2, b: 6},
  {a: 3, b: 7},
  {a: 4, b: 8}
]

inshort from array of object i want to select only few fields(more than one)

how to do that ?

解决方案

You can use .map() with Object Destructuring:

let data = [
    {a:1,b:5,c:9}, {a:2,b:6,c:10},
    {a:3,b:7,c:11}, {a:4,b:8,c:12}
];
          
let result = data.map(({ a, b }) => ({a, b}));

console.log(result);

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

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