如何在 JS 中根据对象 属性 对数组内的项目进行排序

Question

我有一个对象数组：

[
{
Name:
likes:[]
...
}
]

我需要先排序没有 likes 的对象，其中 likes 是未定义的，然后是 likes 数组中只有 1 个项目的对象，然后是 likes 数组中有更多项目的其他对象。怎样才能正确完成？

Answer 1

function sortBy(selector) {
  const cmp = (a, b) => (selector(a) - selector(b));
  return list => list.sort(cmp);
}

const data = [{ Name: "Foo", likes:[{}, {}, {}] }, { Name: "Bar", likes:[{}] }, { Name: "Baz", likes:[{}] }, { Name: "Plugh", likes:[] }];

const sortByLikes = sortBy(({ likes }) => likes.length);

console.log(sortByLikes(data));

Answer 2

var temp = [
{
Name: "abc",
likes: [1,2,3]
},
{
Name: "ac",
likes:[1]
},
{
Name: "bc",
likes:null
},
{
Name: "c",
likes:[1,2,3,4]
}
];

temp = temp.sort((a, b) => {
    if(a.likes === undefined || a.likes === null)
    return -1;
  else if(b.likes === undefined || b.likes === null)
    return 1;
  else{
    return a.likes.length - b.likes.length;
  }
  });

console.log(temp);