Fastest way to sort an array by timestamp

Question

how can i sort this array by timestamp and what is the fastest way (array has many many entries)?

my array

  myList = new Array();

  myList[0]               = {};
  myList[0]['title']      = 'I am really new';
  myList[0]['timestamp']  = 1317039046;
  myList[0]['date']       = '2011-09-26T12:10:46+00:00'; 

  myList[1]               = {};
  myList[1]['title']      = 'I am the oldest';
  myList[1]['timestamp']  = 1315656646;
  myList[1]['date']       = '2011-09-10T12:10:46+00:00';

  myList[2]               = {};
  myList[2]['title']      = 'I am older';
  myList[2]['timestamp']  = 1316866246;
  myList[2]['date']       = '2011-09-24T12:10:46+00:00';

  myList[3]               = {};
  myList[3]['title']      = 'I am old';
  myList[3]['timestamp']  = 1316952646;
  myList[3]['date']       = '2011-09-25T12:10:46+00:00';

example
http://jsbin.com/ejagup/2/edit#preview

Fyi, you can use myList = []; and, if you don't want a global var, prefix it with var: var myList = []; — ThiefMaster
– ThiefMaster, Commented Sep 26, 2011 at 12:42

Rob W · Accepted Answer · 2011-09-26 12:28:20Z

140

myList.sort(function(x, y){
    return x.timestamp - y.timestamp;
})

myList is a JavaScript array, which supports the sort method. This method accepts a function as argument, which sorts the array according to the returned value.

Currently, the sort algorithm will place the element with the lowest timestamp first. Swap x.timestamp and y.timestamp if you want to sort the array in the other direction.

answered Sep 26, 2011 at 12:28

Rob W

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3 Comments

Blazemonger Over a year ago

OP didn't ask, but the sort method can also sort by date -- he only needs to convert the strings into Date objects before subtracting them -- jsbin.com/ejagup/4/edit

m4heshd Over a year ago

@Blazemonger's comment saved me a lot of hassle

MikhailRatner Over a year ago

@Blazemonger for those using TypeScript, you have to add .getTime(), e.g. return date1.getTime() - date2.getTime()

S.B · Accepted Answer · 2022-06-12 00:31:41Z

3

The easiest way to sort an array by date in JavaScript, Here is an example of how this method of sorting an array by date in JavaScript looks

 const fetchMessageData = () => {

        return (
            AllMessagesArr.sort((x, y) => {
                return new Date(x.timestamp) < new Date(y.timestamp) ? 1 : -1
            })
        ).reverse()
    }

         console.log("Display messages in Ascending order" ,fetchMessageData())

Sort the array on basis of timestamp

edited Jun 12, 2022 at 0:31

S.B

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answered Jun 9, 2022 at 14:42

Gourav

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1 Comment

Ethan Over a year ago

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