Question

我有一个对象列表

const array = [
    {club: "Club A", number: 12},
    {club: "Club B", number: 12}
]

我想在其中一个对象中添加新属性

member: ["a", "b"]

应该是

const newArray = [
    {club: "Club A", number: 12, member: ["a", "b"]},
    {club: "Club B", number: 12}
]

尝试过地图

const newArray = array.map(obj => check if obj.club ==="Club A" )

Answer 1

您可以只分配新属性。

经典作业：

const
    array = [{ club: "Club A", number: 12 }, { club: "Club B", number: 12 }],
    member = ["a", "b"];
    
array.find(({ club }) => club === "Club A").member = member;

console.log(array);

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或者采取Object.assign

const
    array = [{ club: "Club A", number: 12 }, { club: "Club B", number: 12 }],
    member = ["a", "b"];
    
Object.assign(array.find(({ club }) => club === "Club A"), { member });

console.log(array);

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Answer 2

您可以使用map和object destrcturing

const array = [{club: "Club A", number: 12},{club: "Club B", number: 12}]
let member = ["a", "b"]

const newArray = array.map(obj => obj.club === "Club A" ? {...obj,member} : obj)

console.log(newArray)

Answer 3

您可以在地图中使用Object.assign

const array = [
    {club: "Club A", number: 12},
    {club: "Club B", number: 12}
]

const member = {member: ["a", "b"]};

const newArray = array.map(obj => obj.club === 'Club A' ? Object.assign(obj, member) : obj);
console.log(newArray);

Answer 4

您可以使用find()来获取要编辑的项目。然后只需为其分配属性：

mapOrientation

JS-在其中一个对象上添加新的属性和值

4 个答案: