javascript - 如果 JSON 对象不存在，则将其添加到该对象中

Question

我有这个 JSON 对象:

var collection = {
    "123":{
      "name": "Some Name",
      "someArray": [
          "value 0",
          "value 1"
       ]
     },
    "124":{
      "name": "Some Name"
     }, 

我有一个方法可以更新并返回集合，例如:

function updateCollection(id, property, value){
return collection;
}

假设方法调用是这样的:

updateCollection(124, someArray, "value 3");

我应该如何更新？我已经写的是:

function updateCollection(id, property, value){
  if(collection[id].hasOwnProperty(property)){
    collection[id][property].push(value);
  }
  else{
   //need help here 
  }
  return collection;
}

调用方法后的预期输出 updateCollection(124, someArray, "value 3");应该是:

"124":{ "name": "Some Name", "someArray": [ "value 3", ] }

Answer 1

创建一个仅包含value的新数组并将其分配给collection[id][property]:

function updateCollection(id, property, value) {
  collection[id] = collection[id] || {}; // if "id" doesn't exist in collection
   if (collection[id].hasOwnProperty(property) {
      collection[id][property].push(value);
    } else {
      collection[id][property] = [value]
    }
    return collection;
  }