从对象数组中获取值[重复]

Question

所以，假设我有这个对象，在它里面，我有一个对象数组。

let partys = {
    "id": 241,
    "name": "Rock Party",
    "type": "party",
    "days": [
        {
            "id": 201,
            "day": "Monday"
        },
        {
            "id": 202,
            "dia": "Friday"
        }
    ],
}

如何仅获取“day”的值？像这样：

let days = ["Monday", "Friday"]

我已经用过Object.values(party.days[0])，但是结果是：

[201, 'Monday']

Answer 1

您可以使用Nullish coalescing operator (??)轻松实现结果

partys.days.map((x) => x.dia ?? x.day);

let partys = {
  id: 241,
  name: "Rock Party",
  type: "party",
  days: [
    {
      id: 201,
      day: "Monday",
    },
    {
      id: 202,
      dia: "Friday",
    },
  ],
};

let days = partys.days.map((x) => x.dia ?? x.day);
console.log(days);

Answer 2

假设dia 是一个错字：

const days = [];
for (let p of partys.days) {
  days.push(p.day);
}
console.log(days)

Answer 3

let partys = {
    "id": 241,
    "name": "Rock Party",
    "type": "party",
    "days": [
        {
            "id": 201,
            "day": "Monday"
        },
        {
            "id": 202,
            "dia": "Friday"
        }
    ],
};

let days = partys.days.map(x => x.dia || x.day);
console.log(days);

这是适用于您的数据的代码。但我真的很确定该属性的名称应该是day 或dia，而不是同时使用。