Question

我有一个对象数组，我想在一个对象中将其转换为对象，其中对象键是对象的属性之一，如：

原始数组的示例：

const myArray = [
  {"groupName":"groupname","description":"nice description here","name":"name1","value":107},
  {"groupName":"groupname","description":"nice description here","name":"name1","value":107}
]

使用es6漂亮的新功能，Object.assign非常接近我的需要，但它为对象分配数字键，如：

let newObject = Object.assign({}, myArray);

这给了我一个非常接近的对象，如：

{
  "0": {"groupName":"groupname","description":"nice description here","name":"name1","value":107},
  "1": {"groupName":"groupname","description":"nice description here","name":"name1","value":107}
}

但我真正需要的是将对象的一个属性作为键而不是分配的数字，例如：

{
  "name1": {"groupName":"groupname","description":"nice description here","name":"name1","value":107},
  "name2": {"groupName":"groupname","description":"nice description here","name":"name2","value":107}
}

我可以迭代并创建对象但是在使用Object.assign给出了一个非常接近的解决方案后，我想知道是否有一种方法在es6中执行相同的操作而不使用forEach或map进行迭代。

想法？

Answer 1

要将数组转换为具有特定值作为键的对象，您需要迭代数组，并构建对象＆＃39;属性。

使用Array#reduce来＆＃34;手动＆＃34;向对象添加属性：

＆＃13;

const myArray = [{"groupName":"groupname","description":"nice description here","name":"name1","value":107}, {"groupName":"groupname","description":"nice description here","name":"name2","value":107}]

const result = myArray.reduce((r, o) => (r[o.name] = o, r), {});

console.log(result);

＆＃13;

或

使用Array#map使用键包装对象中的每个对象，然后使用Object#assign和spread将它们组合到单个对象：

＆＃13;
＆＃13;
const myArray = [{"groupName":"groupname","description":"nice description here","name":"name1","value":107}, {"groupName":"groupname","description":"nice description here","name":"name2","value":107}] const result = Object.assign({}, ...myArray.map((o) => ({ [o.name]: o }))); console.log(result);
＆＃13;
＆＃13;
＆＃13;

Answer 2

那么，当简单的操作可以工作时，为什么需要以map / reduce / forEach的形式使用es6和循环。

let myArray = [
  {"groupName":"groupname","description":"nice description here","name":"name1","value":107},
  {"groupName":"groupname","description":"nice description here","name":"name2","value":108}
]
let newObject ={};
newObject[myArray[0].name] = myArray[0];
newObject[myArray[1].name] = myArray[1];
console.log(newObject);

使用对象的属性作为键转换对象列表中的对象数组

2 个答案:

或