JQuery Sorting array of object using date [duplicate]

Question

I have an array of objects which includes lastModifiedDate property in each object. I want to sort the array of objects according to lastModifiedDate property in ascending as well as descending order. If the dates are same then the sorting should be based on time of the date.

var completeData = [{name: 'xyz', lastModifiedDate: 1579329711458}, {name: 'abc', lastModifiedDate: 1579339014519}]

I have tried the below code to sort the above array.

For Ascending order:

completeData.sort(function(a, b){
   return new Date( a.lastModifiedDate ) < new Date( b.lastModifiedDate );
});

For Descending order:

completeData.sort(function(a, b){
    return new Date( a.lastModifiedDate ) > new Date( b.lastModifiedDate );
});

Both your code samples for ascending and descending sorting look the same. — uminder
– uminder, Commented Jan 18, 2020 at 10:50
There's no need to transform lastModifiedDate into a Date. — uminder
– uminder, Commented Jan 18, 2020 at 10:53

Haresh Vidja · Accepted Answer · 2020-01-18 10:53:52Z

2

If lastModifiedDate is numberic value of timestamp then why need to compare date object of those timestamps you can compare those numbers only for efficient execution of sort as below.

completeData.sort(function(a, b){
   return  a.lastModifiedDate - b.lastModifiedDate;
});

When you need to display date formate you can use Date object for presentation purpose.

answered Jan 18, 2020 at 10:53

Haresh Vidja

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2 Comments

Haresh Vidja Over a year ago

@Tales please check jsfiddle jsfiddle.net/t3m2bcgL it is working correctly.. if you want in descending order then you have to use return b.lastModifiedDate - a.lastModifiedDate;

Tales Over a year ago

Thanks you. Its working

Pushprajsinh Chudasama · Accepted Answer · 2020-01-18 10:56:50Z

For Descending ,

completeData.sort(function(a, b){
                var nameA= a.lastModifiedDate, nameB=b.lastModifiedDate
                if (nameA < nameB) 
                    return 1 
                if (nameA > nameB)
                    return -1
                return 0 //default return value (no sorting)
            });

For ascending ,

completeData.sort(function(a, b){
                    var nameA= a.lastModifiedDate, nameB=b.lastModifiedDate
                    if (nameA < nameB) 
                        return -1 
                    if (nameA > nameB)
                        return 1
                    return 0 //default return value (no sorting)
                });

This is for Date.

Nihar Ranjan Das · Accepted Answer · 2020-01-18 11:02:15Z

1

var completeData = [
  {
     name: 'xyz', 
     lastModifiedDate: 1579329711458
  },
  {
     name: 'abc', 
     lastModifiedDate: 1579339014519
  }
];
var result = completeData.sort(function (a, b) {
   return b.lastModifiedDate - a.lastModifiedDate;
})

console.log(result);

answered Jan 18, 2020 at 11:02

Nihar Ranjan Das

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