CODEWITHSUNDEEP
javascriptjson
JoshG
JoshG

Reputation: 6735

Create new object that contains elements from original object

I have an object with data formatted similar to the following...

var origData = {data: [
    ['Header1', 'Header2', 'Header3'],
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8]
    ]};

What I'd like to do is reformat this such that the data is structured like this...

newData = {
    {'Header1': 0, 'Header2': 1, 'Header3': 2},
    {'Header1': 3, 'Header2': 4, 'Header3': 5},
    {'Header1': 6, 'Header2': 7, 'Header3': 8}
    };

Every time I try to write a possible solution, I get lost in nested for loops. I have a feeling I'm over-complicating this.

The header array is origData.data[0].

The data arrays can be retrieved using:

dataArrays = [];

for (var i = 1; i < origData.data.length; i++) {
    dataArrays.push(origData.data[i]);
}

At this point, this is where I start getting confused. Basically, I need to construct a new object in a for loop that contains the header array elements as the keys, and the respective data array elements as the values.

Any help would be greatly appreciated. Thank you!

Upvotes: 0

Views: 81

Answers (5)

ozil
ozil

Reputation: 7117

var origData = {data: [
    ['Header1', 'Header2', 'Header3'],
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8]
    ]};
var result = [];
for (i=1; i< origData.data.length; i++){
    var obj = {};
    obj[origData.data[0][0]]=origData.data[i][0];
    obj[origData.data[0][1]]=origData.data[i][1];
    obj[origData.data[0][2]]=origData.data[i][2];
    result.push(obj);

}
alert(JSON.stringify(result));

DEMO

Upvotes: 0

toomanyredirects
toomanyredirects

Reputation: 2002

You know the header element is always at offset 0 in origData, you also know that in each array in the origData parent array, there are 3 items at indexes 0, 1, and 2. Therefore you only need one loop, starting from index 1 which creates a new object referencing back to origData offset 0 for the header at each index and then the current iteration's object for the values.

Try this:

var newData = new Array(),
    obj;
for (var i=1; i<origData.data.length; i++) {
  obj = new Object();
  obj[origData.data[0][0]] = origData.data[i][0];
  obj[origData.data[0][1]] = origData.data[i][1];
  obj[origData.data[0][2]] = origData.data[i][2];
  newData.push(obj);
}

Upvotes: 0

Guffa
Guffa

Reputation: 700372

The result should be an array of object rather than an object of objects:

newData = [
  {'Header1': 0, 'Header2': 1, 'Header3': 2},
  {'Header1': 3, 'Header2': 4, 'Header3': 5},
  {'Header1': 6, 'Header2': 7, 'Header3': 8}
];

Here is how you can create it:

var origData = {data: [
    ['Header1', 'Header2', 'Header3'],
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8]
]};

var newData = [];

// get the headers
var headers = origData.data[0];

// loop through the original data arrays
for (var i = 1 ; i < origData.data.length; i++) {

  // get the data array for this item
  var data = origData.data[i];

  // create an empty item
  var item = {};

  // combine headers with values into the item
  for (var j = 0; j < headers.length; j++) {
    item[headers[j]] = data[j];
  }

  // add the item to the array
  newData.push(item);
}

// Show result in StackOverflow snippet
document.write(JSON.stringify(newData));

Upvotes: 1

Yangguang
Yangguang

Reputation: 1785

jsfiddle

var headers = origData.data.shift();
var newData = [];
origData.data.forEach(function (arr) {
    var obj = {};
    arr.forEach(function (val, i) {
        obj[headers[i]] = val;
    });
    newData.push(obj);
})
console.log('newData',newData);

Upvotes: 0

Rytmis
Rytmis

Reputation: 32047

Here's a quick (untested) stab at attacking your problem:

var origData = {data: [
    ['Header1', 'Header2', 'Header3'],
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8]
]};

var headers = origData.data[0];
var i, j;
var result = [];
var row, item;

// start from the row after the headers
for (i = 1; i < origData.data.length; i++) {
    row = origData.data[i];
    item = {}

    // assume that we've got an entry for each header in the individual rows
    for (j = 0; j < headers.length; j++) {
        item[headers[j]] = row[j];
    }

    result.push(item);
}

Upvotes: 0

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