Javascript - Restructure array of objects - Stack Overflow

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I currently have an array of objects that looks like this:

[
    {
        "key":"CES0000000001",
        "25568.95655":"29923",
        "25568.96078":"31603"
    },
    {
        "key":"CES0000000001",
        "25568.96501":"34480",
        "25568.96924":"38347"
    }
]

I'm trying to figure out the best way to restructure this data to look like this:

[
    {
        "key":"CES0000000002",
        "values": [ [ 25568.95655 , 29923 ] , [ 25568.96078 , 31603 ] ]
    },

    {
        "key":"CES0000000002",
        "values": [ [ 25568.96501 , 34480 ] , [ 25568.96924 , 38347 ] ]
    }
]

Can anyone provide some advice for this and any good resources for restructuring javascript objects? I'm getting more into visualization using d3.js and data formatting is key.

I currently have an array of objects that looks like this:

[
    {
        "key":"CES0000000001",
        "25568.95655":"29923",
        "25568.96078":"31603"
    },
    {
        "key":"CES0000000001",
        "25568.96501":"34480",
        "25568.96924":"38347"
    }
]

I'm trying to figure out the best way to restructure this data to look like this:

[
    {
        "key":"CES0000000002",
        "values": [ [ 25568.95655 , 29923 ] , [ 25568.96078 , 31603 ] ]
    },

    {
        "key":"CES0000000002",
        "values": [ [ 25568.96501 , 34480 ] , [ 25568.96924 , 38347 ] ]
    }
]

Can anyone provide some advice for this and any good resources for restructuring javascript objects? I'm getting more into visualization using d3.js and data formatting is key.

• javascript
• arrays
• object
• d3.js
• formatting

Share Improve this question Follow edited Oct 28, 2014 at 23:55 thefreeline asked Oct 28, 2014 at 23:07 thefreelinethefreeline 63111 gold badge1212 silver badges2626 bronze badges 3

• 1 Seems like all you need to do is loop over the array and create some now objects with a key and values property. What specifically are you stuck on? – user1106925 Commented Oct 28, 2014 at 23:09
• And where is the second object getting its key from? It's not represented in the original data. – user1106925 Commented Oct 28, 2014 at 23:11
• Corrected the typo with the second object key. I'm just not accustomed to working with arrays/objects and wasn't sure which methods I should be using here. iSchluff provided a straightforward example that gets the job done. Thanks! – thefreeline Commented Oct 28, 2014 at 23:58

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2 Answers 2

Sorted by: Reset to default 6

my solution would be

    var arr= [
    {
        "key":"CES0000000001",
        "25568.95655":"29923",
        "25568.96078":"31603"
    },
    {
        "25568.96501":"34480",
        "25568.96924":"38347"
    }
];

var transformed= arr.map(function(obj){
    var result= {
        key: obj.key,
        values: []
    }

    for (var key in obj) {
      if (obj.hasOwnProperty(key) && key !== "key") {
          result.values.push([key, obj[key]]);
      }
    }
    return result;
});

console.log(transformed);

This is an old post I see, but I want to share how you could do this with es6 object destructuring and restructuring. if you have an object...

const obj1 = {
    "key":"CES0000000001",
    "25568.95655":"29923",
    "25568.96078":"31603"
};

you could have:

const restructure = ({key, ...values}) => ({key, Object.entries(values)});
const obj2 = restructure(obj1);

or for the array you could restructure all of them with:

const b = arr.map(({key, ...values}) => ({key, Object.entries(values)}));

or if you are reusing the function...

const b = arr.map(restructure);

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