将JSON转换为关联数组

Question

I want to convert a JSON response to associative array but looks like I was not able to make it right.

Here is my JSON sample response:

{
   "response":[
  {
     "id":100,
     "certificate":{
        "id":1,
        "title":"Lorem ipsum dolor sit amet, consectetur adipiscing elit."

     },
     "created_at":"2013-12-02T15:20:08.233Z"

  },
  {
     "id":101,
     "certificate":{
        "id":2,
        "title":"Aenean facilisis, nisl vitae pulvinar varius."
     },
     "created_at":"2013-12-02T15:20:08.240Z"

  }
 ],
"count":2
}

This is what I have tried so far:

    var len = obj.response.length;
    var rData = [];
    var gcData = [];


    for(var i = 0; i < len; i++){

        rData[i] = $.map(obj.response[i], function(value, index) {

            if(typeof value=="object"){
                gcData = $.map(value, function(value1, index) {
                    return [value1];
                });

                return gcData;

            }else{              
                return [value];
            }
        });     

    }

My expected output:

rData = [
    100 : [
           id: ["100"],
           certificate: [
              id: ["1"],
              title: ["Lorem ipsum dolor sit amet, consectetur adipiscing elit."]
           ],
           created_at: ["2013-12-02T15:20:08.240Z"]   

         ]
    101 : [
           id: ["101"],
           certificate: [
              id: ["2"],
              title: ["Aenean facilisis, nisl vitae pulvinar varius."]
           ],
           created_at: ["2013-12-02T15:20:08.240Z"]   

         ]

]

Please help. Thanks.

Answer 1

I just want to group it by keys something like I have in expected output

It seems you want to create an id -> object map. To do that you just have to iterate over the array, take the id attribute of each object as property name and assign the object (the element of the array) to that property of the map.

Example:

var map = {};
var response = obj.response;

for (var i = 0, l = response.length; i < l; i++) {
    map[response[i].id] = response[i];
}

console.log(map);

Each object inside the array is already in the structure you want it to be. The output is

{
    "100": {
        "id": 100,
        "certificate": {
            "id": 1,
            "title": "Lorem ipsum dolor sit amet, consectetur adipiscing elit."
        },
        "created_at": "2013-12-02T15:20:08.233Z"
    },
    "101": {
        "id": 101,
        "certificate": {
            "id": 2,
            "title": "Aenean facilisis, nisl vitae pulvinar varius."
        },
        "created_at": "2013-12-02T15:20:08.240Z" 
    }
}

Answer 2

your desired JSON is incorrect.

It isn't clear if you want to create an array of arrays or an object of arrays or what. To help decide which option fits your need, try this code

var a=[];
var o={};

for (var i=0, l=response.length; i<l; i++) {
  var e = response[i];
  a[e.id] = e.certificate;
  o[e.id] = e.certificate;
}

console.log(JSON.stringify(a));
console.log(JSON.stringify(o));