Reordering a JSON list collection in JavaScript

Question

I have a list of JSON objects in my javascript code:

var cached4= [];

cached4.push({ Frame: 'frame', TS: 20150809101523723 });
cached4.push({ Frame: 'frame', TS: 20150809101513165 });
cached4.push({ Frame: 'frame', TS: 20150809101514988 });

I now want to reorder this array in TS order so that my result would be like this:

20150809101513165 
20150809101514988 
20150809101523723

Now obviously I can enumerate through the array like so:

cached4.forEach(function (entry) {
    cached4.shift();

});

But is there a 'linqy' type of way of ding this?

Hi, take a look at <linqjs.codeplex.com> i think that contains what you need. It is what i found at first search on google:) — George Lica
– George Lica, Commented Aug 8, 2015 at 16:35

Community · Accepted Answer · 2017-05-23 11:43:54Z

3

You can use Array.prototype.sort:

The sort() method sorts the elements of an array in place and returns the array. The sort is not necessarily stable. The default sort order is according to string Unicode code points.

var sortedCached4 = cached4.sort(function (a, b) { 
  return a.TS - b.TS;
});

Which sorts the values by ascending TS:

[
  {"Frame":"frame","TS":20150809101513165},
  {"Frame":"frame","TS":20150809101514988},
  {"Frame":"frame","TS":20150809101523723}
]

Edit: Note that your TS is larger than the safest integer value of 9007199254740991 which means that they lose precision, see What is JavaScript's highest integer value that a Number can go to without losing precision? for more information.

To test it out, enter 20150809101513165 to a console and see the result.

edit 2: As pointed out in the comments, comparing with - is better.

edited May 23, 2017 at 11:43

CommunityBot

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answered Aug 8, 2015 at 16:32

Pete TNT

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5 Comments

Craig Stroman Over a year ago

It would be better to use var sortedCached4 = cached4.sort(function (a, b) { return a.TS - b.TS; });

smnbbrv Over a year ago

> will sort as a string, use ´-´ to sort as numbers. This maybe irrelevant in the concrete case but for others it can be useful

Pete TNT Over a year ago

@CraigStroman and simon, you are both correct. Changed the comparison, thanks.

Andrew Simpson Over a year ago

Thanks for that info. I have supplied smaller number. Cheers :)

royhowie Over a year ago

@AndrewSimpson if TS means time stamp, you should parse the numbers as dates before sorting (you'll have to roll your own parser, since new Date(TS) probably won't work).

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