如何根据属性过滤掉项目？答案

【问题标题】：How to filter out item based on properties?如何根据属性过滤掉项目？
【发布时间】：2019-05-29 14:01:59
【问题描述】：

我想重构代码使用过滤器而不是 lodash _forEach，下面的过滤器代码没有返回预期的响应。知道这里有什么错误吗？

main.js

const response = [];
const data = [{
    "isBrand": true,
    "drugName": "Lipitor",
    "specialtyPrice": {}
  },
  {
    "isBrand": false,
    "drugName": "Atorvastatin Calcium",
    "drugStrength": "80mg",
    "drugForm": "Tablet",
    "mailPrice": {
      "totalQuantity": 90,
      "rejectMessage": [{
        "settlementCode": "99",
        "settlementDesc": "Sorry, the system is temporarily:Lo sentimos,Intente(Código de error 85)"
      }]
    },
    "retailPrice": {
      "totalQuantity": 30,
      "rejectMessage": [{
        "settlementCode": "99",
        "settlementDesc": "Sorry, the system is temporarily:Lo sentimos,Intente(Código de error 85)"
      }]
    },
    "specialtyPrice": {}
  }
];
_.forEach(data, function(drug) {
  if (drug.retailPrice !== undefined || drug.mailPrice !== undefined) {
    response.push(drug);
  }
});

const filterItems = data.filter(item => item.retailPrice && item.mailPrice)

console.log(filterItems);

&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"&gt;&lt;/script&gt;

预期结果

[{
            "isBrand": false,
            "drugName": "Atorvastatin Calcium",
            "drugStrength": "80mg",
            "drugForm": "Tablet",
            "mailPrice": {
                "totalQuantity": 90,
                "rejectMessage": [{
                    "settlementCode": "99",
                    "settlementDesc": "Sorry, the system is temporarily:Lo sentimos,Intente(Código de error 85)"
                }]
            },
            "retailPrice": {
                "totalQuantity": 30,
                "rejectMessage": [{
                    "settlementCode": "99",
                    "settlementDesc": "Sorry, the system is temporarily:Lo sentimos,Intente(Código de error 85)"
                }]
            },
            "specialtyPrice": {}
        }
    ];

【问题讨论】：

您已将 || 更改为 &&。此外，并非每个 falsy 值都是 undefined
这段代码运行良好
我看不出结果和想要的结果有什么区别。
对我来说很好用

标签： javascript arrays ecmascript-6

【解决方案1】：

这应该可行。

var objNotEmpty = function(obj){
    return Object.keys(obj).length > 0;
 },
 objHasPrice = function(obj){
    return obj.hasOwnProperty("mailPrice") && obj.hasOwnProperty("retailPrice");
 };


const filterItems = data.filter( item => return objHasPrice(item) && objNotEmpty(item.mailPrice) && objNotEmpty(item.retailPrice);

【讨论】：

【解决方案2】：

你可以像这样简单地做Array.forEach：

data.forEach(d => (d.retailPrice || d.mailPrice) ? response.push(d) : null)

所以它看起来像这样：

const response = [];
const data = [{
    "isBrand": true,
    "drugName": "Lipitor",
    "specialtyPrice": {}
  },
  {
    "isBrand": false,
    "drugName": "Atorvastatin Calcium",
    "drugStrength": "80mg",
    "drugForm": "Tablet",
    "mailPrice": {
      "totalQuantity": 90,
      "rejectMessage": [{
        "settlementCode": "99",
        "settlementDesc": "Sorry, the system is temporarily:Lo sentimos,Intente(Código de error 85)"
      }]
    },
    "retailPrice": {
      "totalQuantity": 30,
      "rejectMessage": [{
        "settlementCode": "99",
        "settlementDesc": "Sorry, the system is temporarily:Lo sentimos,Intente(Código de error 85)"
      }]
    },
    "specialtyPrice": {}
  }
];

data.forEach(d => (d.retailPrice || d.mailPrice) ? response.push(d) : null)

const filterItems = data.filter(item => item.retailPrice && item.mailPrice)

console.log(filterItems);

【讨论】：