js change structure of an json object

Question

I have an array like this:

let array =  [
      {1: {
        "date": "2014-04-23 00:00:00",
        "volumetrie": "22458"
      }},
      {2: {
        "date": "2014-05-02 00:00:00",
        "volumetrie": "30585"
      }},
      {3: {
        "date": "2014-03-27 00:00:00",
        "volumetrie": "49536"
      }}
    ]

But I need this like this:

let array =  [
      {
        "date": "2014-04-23 00:00:00",
        "volumetrie": "22458"
      },
      {
        "date": "2014-05-02 00:00:00",
        "volumetrie": "30585"
      },
      {
        "date": "2014-03-27 00:00:00",
        "volumetrie": "49536"
      }
    ]

I tried to change this like:

array.forEach(function(e){
          newData.push(e);
        });

But this does not work. Push is not supported.

Next try was:

let newData = {};
        array.forEach(function(e){
          newData = {...newData, ...e};
        });

No success. Any ideas how to get the result?

Answer 1

You could get a flat array of values of the objects.

 let array = [{ 1: { date: "2014-04-23 00:00:00", volumetrie: "22458" } }, { 2: { date: "2014-05-02 00:00:00", volumetrie: "30585" } }, { 3: { date: "2014-03-27 00:00:00", volumetrie: "49536" } }], result = array.flatMap(Object.values); console.log(result);

 .as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

Assuming the objects in your array always have one enumerable property, you can do it with map and Object.values :

array = array.map(obj => Object.values(obj)[0]);

Live Example:

 let array = [ {1: { "date": "2014-04-23 00:00:00", "volumetrie": "22458" }}, {2: { "date": "2014-05-02 00:00:00", "volumetrie": "30585" }}, {3: { "date": "2014-03-27 00:00:00", "volumetrie": "49536" }} ]; array = array.map(obj => Object.values(obj)[0]); console.log(array);

 .as-console-wrapper { max-height: 100% !important; }

But see also Nina's solution using flatMap , which is just beautiful.

Answer 3

You can simply map every item in the array to a new item, which is the value of the first key of the original item:

 let array = [ { 1: { "date": "2014-04-23 00:00:00", "volumetrie": "22458" }}, { 2: { "date": "2014-05-02 00:00:00", "volumetrie": "30585" }}, { 3: { "date": "2014-03-27 00:00:00", "volumetrie": "49536" }} ]; let formatted = array.map(v => { for (let k in v) return v[k]; }); console.log(formatted);

Answer 4

Try this:

const oldData = [
    {1: {
        "date": "2014-04-23 00:00:00",
        "volumetrie": "22458"
    }},
    {2: {
        "date": "2014-05-02 00:00:00",
        "volumetrie": "30585"
    }},
    {3: {
        "date": "2014-03-27 00:00:00",
        "volumetrie": "49536"
    }}
];
const newData = [];

for (let i = 0; i < oldData.length; i++) {
    newData[i] = oldData[i][i+1];
}