JavaScript 对象属性到数组

Question

我有以下对象:

const movies = {
  1: {
    id: 1,
    name: 'Planet Earth',
  },
  2: {
    id: 2,
    name: 'Selma',
  },
  3: {
    id: 3,
    name: 'Million Dollar Baby',
  },
  4: {
    id: 4,
    name: 'Forrest Gump',
  },
  5: {
    id: 5,
    name: 'Get Out',
  },
};

然后我想要一个只有属性 id 的数组。为此，我尝试了类似的方法:

const moviesArray = Object.values(movies);
const idArray = moviesArray.map(movie => Object.values(movie)[0]);
console.log(idArray);

它正确打印 idArray 但我的问题是我是否缺少解决此问题的方法。

Answer 1

您可以直接使用 id 属性:

const
    movies = { 1: { id: 1, name: 'Planet Earth' }, 2: { id: 2, name: 'Selma' }, 3: { id: 3, name: 'Million Dollar Baby' }, 4: { id: 4, name: 'Forrest Gump' }, 5: { id: 5, name: 'Get Out' } },
    moviesArray = Object.values(movies),
    idArray = moviesArray.map(movie => movie.id);

console.log(idArray);