Sort large set of array data with date and time using java script

Question

Have a large list of array data of which can exceed to N number. Need to sort the array elements with latest date and time.

let array = [{"name": "Apple","modified_date": "2020-08-26 02:03:23.756"},
             {"name": "Orange","modified_date": "2020-08-26 03:03:23.756"},
             {"name": "Grapes","modified_date": "2020-08-26 04:03:23.756"}................N number length]

able to sort using small size of array

let sort = array.sort(function(a, b) { 
            return (new Date(b.modified_date)).getTime() - (new Date(a.modified_date)).getTime();
        });

But with large length array correct sorting is not happening.What could be the issue!!!!?

Plus 542 is not that big to be honest, you might get a bit of a freeze when tackling 1m+ entries, in which case you could proceed within a web worker (it won't reduce the sorting time, but will allow the UI not to freeze). — sp00m
– sp00m, Commented Aug 26, 2020 at 8:52
@Nick I mean correct sorting is not happening among the all N elements of array. — New123
– New123, Commented Aug 26, 2020 at 8:52
I posted and answer, but it would have helped only if your sort function did not finish (as opposed to it not sorting correctly). There is no need to create Date() object. String compare should give you the same result here. — Rahul Bhobe
– Rahul Bhobe, Commented Aug 26, 2020 at 9:00

Rahul Bhobe · Accepted Answer · 2020-09-10 08:09:38Z

2

You could avoid creation of O(2*n*log(n)) Date objects. String compare will yield the same result as Date(str).getTime() compare yields. The string comparison method is a very much better idea.

let array = [{"name": "Apple","modified_date": "2020-08-26 02:03:23.756"},
             {"name": "Orange","modified_date": "2020-08-26 03:03:23.756"},
             {"name": "Grapes","modified_date": "2020-08-26 04:03:23.756"}];

array.sort((a, b) => b.modified_date.localeCompare(a.modified_date));
console.log(array);

edited Sep 10, 2020 at 8:09

answered Aug 26, 2020 at 8:59

Rahul Bhobe

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1 Comment

RobG Over a year ago

Actually the results will be different since in some browsers new Date("2020-08-26 02:03:23.756").getTime() returns NaN. The string comparison method is a very much better idea. ;-)

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