如何递归查找对象密钥是否存在？

Question

我有以下对象

acn: "02 0002 0002"
id: "random"
name: "random"
parent_domain: "parent-random"
subDomainData: {random-l3.1: {…}}
sub_domains: ["random-l3.1"]
timestamp: 1549597441

subDomainData是另一个可能存在或不存在的对象。 如果存在，则它可以具有另一个subDomainData，该子域可以具有一个或多个子代，等等。

我的疑问是如何创建一个函数来递归检查它，如果为true，则将其对象推到另一个数组中。 预期的最终数组将如下所示：

[
    {
      acn: "02 0002 0002"
      id: "random"
      name: "random"
      parent_domain: ""
      sub_domains: ["random-l3.1"]
      timestamp: 1549597441
    },
    { // this object would be the result of the parent subDomainData Object.
      acn: "02 0002 0002"
      id: "random-sub-1"
      name: "random-sub-1"
      parent_domain: "parent-random"
      sub_domains: ["random-l3.3"]
      timestamp: 1549597441
    }
  ]

现在我正在遵循这种方法，事实证明这是不够的：

formatDomainList = () => {
const { domain } = this.props;
const domainList = Object.values(domain.subDomainData);
domainList.map(item => (
  Object.keys(item.subDomainData).length && (
    domainList.push(item.subDomainData)
  )
  //etc
  //etc
));
// console.log('domain list', domainList);

}

Answer 1

这样的事情将为您工作：

//This is your original object
var someObject = {
  acn: "02 0002 0002",
  id: "random",
  name: "random",
  parent_domain: "parent-random",
  subDomainData: { someObjectWith_subDomainData },
  sub_domains: ["random-l3.1"],
  timestamp: 1549597441
 };
 //This will store the list of subDomains in this global variable.
 var subDomainList = [];

 function getSubDomainList(objectToLoop){

  if(objectToLoop.hasOwnProperty('subDomainData')){
    var numOfItems = Object.keys(objectToLoop.subDomainData).length;
    var keys = Object.keys(objectToLoop.subDomainData);
    for(var i = 0; i< numOfItems; i++){
        var key = keys[i];
        var obj = objectToLoop.subDomainData[key];
        subDomainList.push(obj);
        getSubDomainList(obj);
    }
   }
   return;
 }

 getSubDomainList(someObject);
 //The subDomainList will have the array of objects.

Answer 2

我想您的数据格式是错误的，将第一个对象包装在属性中给了您所需的输出

 var sourceObj = { "till-11.1": { _id: "domains/8999693", _key: "8999693", _rev: "_YFjlOei--_", acn: "01 0001 0001", activated: false, id: "till", name: "Till Payments", timestamp: 1549838701, sub_domains: ["till-l2.1", "till-l2.2"], parent_domain: null, subDomainData: { "till-l2.1": { _id: "domains/8999741", _key: "8999741", _rev: "_YFgLFKW--_", acn: "02 0002 0002", activated: false, id: "till-l2.1", name: "Till l2-1", timestamp: 1549597441, sub_domains: ["till-l3.1"], parent_domain: "till", subDomainData: { "till-l3.1": { _id: "domains/9001753", _key: "9001753", _rev: "_YFghVqi--_", acn: "", activated: true, id: "till-l3.1", name: "till l3.1", timestamp: 1549598900, sub_domains: [], parent_domain: "till-l2.1", subDomainData: {}, accessDomains: [] } }, accessDomains: ["till-l3.1"] }, "till-l2.2": { _id: "domains/8999780", _key: "8999780", _rev: "_YFgLcri--_", acn: "02 0002 0002", activated: false, id: "till-l2.2", name: "Till l2-2", timestamp: 1549597465, sub_domains: [], parent_domain: "till", subDomainData: {}, accessDomains: [] } }, accessDomains: ["till-l2.1", "till-l2.2", "till-l3.1"] } }; var result = []; const checkSubDomainData = obj => { Object.keys(obj).forEach(key => { if (obj[key].subDomainData !== {}) { let innerObjs = obj[key].subDomainData; delete obj[key].subDomainData; result.push(obj[key]); checkSubDomainData(innerObjs); } else { return; } }); }; checkSubDomainData(sourceObj); console.log(result);