使用Node或ES6从JSON中过滤记录

Question

我不确定做这件事的最佳方式。例如，我想迭代我的json并找到所有在美国的公司。随着我的应用程序的增长，这个JSON可能会变得更加复杂，比如在级别、对象等方面。我只想知道人们如何使用JSON、Node.js和/或ES6或库(如Lodash等)进行简单的搜索来过滤掉数据子集。

以这个json为例，我有什么方法可以搜索它，只检索那些在美国的公司？

[{
    "id": 0,
    "name": "Company1",
    "logoUrl": "/lib/assets/company1-logo.png",
    "location":{
      "country": "USA",
      "state": "California",
      "city": "Napa"
    },
    "active": false
  },
  {
    "id": 1,
    "name": "Company2",
    "logoUrl": "/lib/assets/company2-logo.png",
    "location":{
      "country": "Germany",
      "state": "",
      "city": "Berlin"
    },
    "active": false
  },
  {
    "id": 2,
    "name": "Company3",
    "logoUrl": "/lib/assets/company3-logo.png",
    "location":{
      "country": "USA",
      "state": "Michigan",
      "city": "Detroit"
    },
    "active": false
  }]

Answer 1

将JavaScript原生方法与ES6 arrow function一起使用

var res = data.filter(v => v.location.country === 'USA');

​

var data = [{
  "id": 0,
  "name": "Company1",
  "logoUrl": "/lib/assets/company1-logo.png",
  "location": {
    "country": "USA",
    "state": "California",
    "city": "Napa"
  },
  "active": false
}, {
  "id": 1,
  "name": "Company2",
  "logoUrl": "/lib/assets/company2-logo.png",
  "location": {
    "country": "Germany",
    "state": "",
    "city": "Berlin"
  },
  "active": false
}, {
  "id": 2,
  "name": "Company3",
  "logoUrl": "/lib/assets/company3-logo.png",
  "location": {
    "country": "USA",
    "state": "Michigan",
    "city": "Detroit"
  },
  "active": false
}];

var res = data.filter(v => v.location.country === 'USA');

console.log(res);

​

Answer 2

您可以使用JavaScript的简单.filter()方法返回满足过滤器的结果列表。假设你的数据是可变数据

ES5

data.filter(function(item) {
  return item.location.country === 'USA';
});

ES6 ：在ES6中，您可以使用箭头函数

data.filter((item) => {
  return item.location.country === 'USA';
});

​

var data = [{
    "id": 0,
    "name": "Company1",
    "logoUrl": "/lib/assets/company1-logo.png",
    "location":{
      "country": "USA",
      "state": "California",
      "city": "Napa"
    },
    "active": false
  },
  {
    "id": 1,
    "name": "Company2",
    "logoUrl": "/lib/assets/company2-logo.png",
    "location":{
      "country": "Germany",
      "state": "",
      "city": "Berlin"
    },
    "active": false
  },
  {
    "id": 2,
    "name": "Company3",
    "logoUrl": "/lib/assets/company3-logo.png",
    "location":{
      "country": "USA",
      "state": "Michigan",
      "city": "Detroit"
    },
    "active": false
  }];

var res1 = data.filter(function(item) {
  return item.location.country === 'USA';
});

const res2 = data.filter((item) => {
  return item.location.country === 'USA';
});

console.log(res1);
console.log(res2);

​

Answer 3

在罗达什，它将是

_.filter(data, function(item) {
  return item.location.country === 'USA';
});