How to convert array of objects into array of arrays

Question

The array of objects looks like this:

[
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000},
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000},
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000},
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000}
]

and the required JavaScript array is:

[
    [160000, 64], [160000, 64], [160000, 64], [160000, 64],
    [160000, 64], [160000, 64], [160000, 64], [160000, 64]
]

I want to convert JSON object data into JavaScipt and JSON data which I supply is given above and JavaScript array which I want is also defined. I want a JavaScript methode which solves this problem

You have asked that question before and it was closed for a reason. Read the close reason and edit the question accordingly so it can be reopened. — Felix Kling
– Felix Kling, Commented Aug 3, 2013 at 9:43

Austin Brunkhorst · Accepted Answer · 2013-08-03 09:13:51Z

3

If you're using this exact structure, you can do something like this. Where inputData is the first JSON structure, and outputData will be the data outputted.

var outputData = [];

for(var i = 0; i < inputData.length; i++) {
    var input = inputData[i];

    outputData.push([input.Earning, input.Number]);
}

answered Aug 3, 2013 at 9:13

Austin Brunkhorst

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10 Comments

Niet the Dark Absol Over a year ago

Good, but I would suggest outputData[i] = [...] instead of using .push(), just to save a function call ;)

Austin Brunkhorst Over a year ago

Meh, micro-optimizations, but good point. I just like it for the cleanliness per say.

Niet the Dark Absol Over a year ago

I know, I know, I'm a nut like that XD But if I know the index number already I just like to make use of it.

zerkms Over a year ago

@Kolink: how about var outputData = new Array(inputData.length); then?

zerkms Over a year ago

@Kolink: but then you would have a single allocation

|

Femaref · Accepted Answer · 2013-08-03 09:12:15Z

0

Iterate over the array and construct a new array. Most javascript libraries have a map function where you only need to supply a mapping function to achieve this.

answered Aug 3, 2013 at 9:12

Femaref

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Comments

loxxy · Accepted Answer · 2013-08-03 10:01:47Z

0

This Way (Works only in modern browsers):

var a = [
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000},
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000},
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000},
    {"Number":64,"Earning":160000},{"Number":64,"Earning":160000}
];

var b = a.map(function(i) {  return [i.Earning,i.Number];  });   // New Array

edited Aug 3, 2013 at 10:01

answered Aug 3, 2013 at 9:35

loxxy

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5 Comments

Felix Kling Over a year ago

And where is the result? forEach does not modify the original array.

loxxy Over a year ago

Really? It seems to modify the original array as well... when I checked in my console.

Felix Kling Over a year ago

Somehow you must have checked it wrong ;) developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

loxxy Over a year ago

Really sorry about the mistake. I did use map in console... which gave me the other result.

Felix Kling Over a year ago

.map returns the new array though, so you have to assign the result to a variable.

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