Question

166

Sort array of objects with date field by date

rated 0 times [ 170] [ 4] / answers: 1 / hits: 145209 / 8 Years ago, mon, december 5, 2016, 12:00:00

Given the following array of objects, I need to ascending sort them by the date field.

var myArray = [

  {

    name: "Joe Blow",

    date: "Mon Oct 31 2016 00:00:00 GMT-0700 (PDT)"

  },

  {

    name: "Sam Snead",

    date: "Sun Oct 30 2016 00:00:00 GMT-0700 (PDT)"

  },

  {

    name: "John Smith",

    date: "Sat Oct 29 2016 00:00:00 GMT-0700 (PDT)"  

  }

];

In the above example, the final result would be John Smith, Sam Snead, and Joe Blow.

I am trying to use lodash's _.sortBy(), but I can't get any sorting to take place no matter how I try to use it:

_.sortBy(myArray, function(dateObj) {

  return dateObj.date;

});

or

_.sortBy(myArray, 'date');

What do I need to change to get my array sorted properly? I also have Moment.js, so I can use it to format the date string if needed. I tried converting the date property using .unix(), but that didn't make a difference.

Thanks.

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masonm

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answered 8 Years ago arthur · Accepted Answer

You don't really need lodash. You can use JavaScript's Array.prototype.sort method.

You'll need to create Date objects from your date strings before you can compare them.

var myArray = [{

  name: Joe Blow,

  date: Mon Oct 31 2016 00:00:00 GMT-0700 (PDT)

}, {

  name: Sam Snead,

  date: Sun Oct 30 2016 00:00:00 GMT-0700 (PDT)

}, {

  name: John Smith,

  date: Sat Oct 29 2016 00:00:00 GMT-0700 (PDT)

}];



myArray.sort(function compare(a, b) {

  var dateA = new Date(a.date);

  var dateB = new Date(b.date);

  return dateA - dateB;

});



console.log(myArray);