javascript - 数组 > 对象 : how to index an array of objects with reduce, 省略结果中嵌套元素的索引(es2017)？

Question

我有一个像这样的数组:

const peopleArray = [
    {
        "id": "Antoine",
        "country": "France"
    },
    {
        "id": "Alejandro",
        "country": "Spain"
    }
]

我想表示为像这样的对象(请注意 id 不是属性):

{
    "Antoine": {
        "country": "France"

    },
    "Alejandro": {
        "country": "Spain"
    }
}

到目前为止，我发现我可以做到这一点(优雅!):

peopleArray.reduce( (ac, p) => ({...ac, [p.id]: p }), {} )

产生:

{
    "Antoine": {
        "id": "Antoine",
        "country": "France"

    },
    "Alejandro": {
        "id": "Alejandro",
        "country": "Spain"
    }
}

我不知道如何以简洁/优雅的方式完成相同的任务，从而省略 id 。

正在寻找适用于 Node.js 版本 8.11.1 的纯 javascript es2017 解决方案。

Answer 1

如果您想以id作为键并以剩余对象作为value来创建和对象。您可以尝试使用Rest Parameters进行以下操作

ES2017

const peopleArray = [{"id": "Antoine","country": "France"},{"id": "Alejandro","country": "Spain"}];

const result = peopleArray.reduce( (ac, o) => { 
  ac[o.id] = Object.assign({}, o); 
  delete ac[o.id].id; 
  return ac; 
}, {});
console.log(result);

ES2018 - 将能够使用对象的静态参数

const peopleArray = [{"id": "Antoine","country": "France"},{"id": "Alejandro","country": "Spain"}];

const result = peopleArray.reduce( (ac, {id, ...rest}) => Object.assign(ac, {[id]: rest}), {} );
console.log(result);