如何使用 Lodash sortBy 进行排序？

Question

我有一个类似下面的数组，我正在尝试使用 lodash 按价格对数组中的项目进行排序，但我认为它不起作用。请让我知道这里出了什么问题，根据 lodash 文档，它将采用一个数组并应返回排序后的数组。

我的数据

var items= [
  {
    "total": 11,
    "productGroup": {
      "_id": "5834754f0acc770ce14b1378",
      "name": "Auto Biography",
      "description": "Yum",
      "type": "book"
    },    
    "_id": "58791af46c698c00475e7f41",    
    "price": 200,
    "sold": 0
  },
  {
    "total": 11,
    "productGroup": {
      "_id": "5834754f0acc770ce14b1378",
      "name": "Science Fiction",
      "description": "Yum",
      "type": "book"
    },    
    "_id": "58791af46c698c00475e7f41",    
    "price": 120,
    "sold": 0
  },
  {
    "total": 11,
    "productGroup": {
      "_id": "5834754f0acc770ce14b1378",
      "name": "Language",
      "description": "Yum",
      "type": "book"
    },    
    "_id": "58791af46c698c00475e7f41",    
    "price": 125,
    "sold": 0
  },
  {
    "total": 11,
    "productGroup": {
      "_id": "5834754f0acc770ce14b1378",
      "name": "Fiction",
      "description": "Yum",
      "type": "book"
    },    
    "_id": "58791af46c698c00475e7f41",    
    "price": 300,
    "sold": 0
  }
]

排序代码

items = _.sortBy(items, item=>{return item.price});

Answer 1

您很可能使用的是旧版本的 Lodash。它适用于 4.17.2，如下所示。

var items = [
  {
    "_id": "58791af46c698c00475e7f41",    
    "price": 200
  },
  {
    "_id": "58791af46c698c00475e7f41",    
    "price": 120
  },
  {
    "_id": "58791af46c698c00475e7f41",    
    "price": 125
  },
  {
    "_id": "58791af46c698c00475e7f41",    
    "price": 300
  }
];

var results = _.sortBy(items, item => item.price);
console.log(results);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.2/lodash.min.js"></script>

Answer 2

根据source code，第二个参数应该是一个迭代数组。要解决此问题，您需要将匿名函数放入数组中，例如

items = _.sortBy(items, [item=>{return item.price}]);