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How can I add to a json array in javascript?

I have data being pulled in from various sources, each returning some form of json or similar, although, differently formatted each time. I need to get them all into one array, but I can't figure out how to do it.

The first set is an array like this:

[
 Object {id="70", type="ab", dateadded="12345678"},
 Object {id="85", type="ab", dateadded="87654321"}, ... more items ...
]

The second set is being pulled in from Facebook, and is like this:

[
 Object {id="12341234234", created_time="12345678"},
 Object {id="567856785678", created_time="87654321"}, ... more items ...
]

So, I need to alter the second set so that it has 'type', and it has 'dateadded' instead of 'created_time', and then I need to get this all into one array so it can be sorted on 'dateadded'.

I've no idea how to do this! Can anyone help?

Thanks!

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This is no valid JSON String, is it? – jantimon Aug 24 '11 at 11:28

2 Answers

up vote 2 down vote accepted

Assuming you have actual valid JSON instead of what you quoted above:

var jsonOld = '[{"id":"70","type":"ab","dateadded":"12345678"},{"id":"85","type":"ab","dateadded":"87654321"}]',
    jsonNew = '[{"id":"12341234234","created_time":"12345678"},{"id":"567856785678","created_time":"87654321"}]';

Then first parse these values into actual Javascript arrays:

var mainArr = JSON.parse(jsonOld),
    newArr = JSON.parse(jsonNew);

(If you already have actual Javascript arrays instead of JSON strings then skip the above step.)

Then just iterate over newArr and change the properties you need changed:

for (var i = 0, il = newArr.length; i < il; i++) {
    newArr[i].type = 'ab';
    newArr[i].dateadded = newArr[i].created_time;
    delete newArr[i].created_time;
}

And concatenate newArr into mainArr:

mainArr = mainArr.concat(newArr);

And sort on dateadded:

mainArr.sort(function(a, b) { return a.dateadded - b.dateadded; });

This will result in:

[{"id":"70","type":"ab","dateadded":"12345678"},
 {"id":"12341234234","type":"ab","dateadded":"12345678"},
 {"id":"85","type":"ab","dateadded":"87654321"},
 {"id":"567856785678","type":"ab","dateadded":"87654321"}]

See example

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Thanks! Yeah, I mangled what I have above, but the data is in the form you described, so this should work. Thanks again. – Sharon Aug 24 '11 at 13:44
up vote 2 down vote

Use the first array's push() method:

// for each item in second array
    firstArray.push(convert(item));

function convert(obj) {
    // Convert obj into format compatible with first array and return it
}

Hope this helps.

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+1 Quicker, more concise solution to my problem. Brevity FTW! – Rap Nov 29 '11 at 20:02

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