如何根据类别对数组进行排序？

Question

我有以下对象数组：

var source =  [
  {"name": "title_1", "category": "order"},
  {"name": "title_2", "category": "purchase"},
  {"name": "title_3", "category": "order"},
  {"name": "title_4", "category": "detail"},
  {"name": "title_5", "category": "order"},
  {"name": "title_6", "category": "purchase"},
]

我需要对该数组进行排序以按顺序获取元素（第一个 - 订单，第二个 - 详细信息，第三个 - 购买）：

console.log(source.sort(function () {
   // todo: ?
}))

预期结果：

[
  {"name": "title_1", "category": "order"},
  {"name": "title_3", "category": "order"},
  {"name": "title_5", "category": "order"},
  {"name": "title_4", "category": "detail"},
  {"name": "title_2", "category": "purchase"},
  {"name": "title_6", "category": "purchase"},
]

如何编写排序函数才能得到预期的结果？

Answer 1

您可以创建一个对象来保存每个类别的优先级，然后根据该对象对其进行排序。

const source =  [
  {"name": "title_1", "category": "order"},
  {"name": "title_2", "category": "purchase"},
  {"name": "title_3", "category": "order"},
  {"name": "title_4", "category": "detail"},
  {"name": "title_5", "category": "order"},
  {"name": "title_6", "category": "purchase"},
];

const priority = {
   order: 3,
   detail: 2,
   purchase: 1,
};

const r = source.sort((a, b) => priority[b.category] - priority[a.category]);
console.log(r);