Sort array of objects by single key with date value

Question

I have an array of objects with several key value pairs, and I need to sort them based on \'updated_at\':

[
    {
        \"updated_at\" : \"2012-01-01T06:25         


        

Answer 1

As for today, answers of @knowbody (https://stackoverflow.com/a/42418963/6778546) and @Rocket Hazmat (https://stackoverflow.com/a/8837511/6778546) can be combined to provide for ES2015 support and correct date handling:

arr.sort((a, b) => {
   const dateA = new Date(a.updated_at);
   const dateB = new Date(b.updated_at);
   return dateA - dateB;
});

Answer 2

Data Imported

[
    {
        "gameStatus": "1",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-20 11:32:04"
    },
    {
        "gameStatus": "0",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 18:08:24"
    },
    {
        "gameStatus": "2",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 18:35:40"
    },
    {
        "gameStatus": "0",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 10:42:53"
    },
    {
        "gameStatus": "2",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-20 10:54:09"
    },
    {
        "gameStatus": "0",
        "userId": "1a2fefb0-5ae2-47eb-82ff-d1b2cc27875a",
        "created_at": "2018-12-19 18:46:22"
    },
    {
        "gameStatus": "1",
        "userId": "7118ed61-d8d9-4098-a81b-484158806d21",
        "created_at": "2018-12-20 10:50:48"
    }
]

FOR Ascending order

arr.sort(function(a, b){
    var keyA = new Date(a.updated_at),
        keyB = new Date(b.updated_at);
    // Compare the 2 dates
    if(keyA < keyB) return -1;
    if(keyA > keyB) return 1;
    return 0;
});

Example for Asc Order

[
    {
        "gameStatus": "0",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 10:42:53"
    },
    {
        "gameStatus": "0",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 18:08:24"
    },
    {
        "gameStatus": "2",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 18:35:40"
    },
    {
        "gameStatus": "0",
        "userId": "1a2fefb0-5ae2-47eb-82ff-d1b2cc27875a",
        "created_at": "2018-12-19 18:46:22"
    },
    {
        "gameStatus": "1",
        "userId": "7118ed61-d8d9-4098-a81b-484158806d21",
        "created_at": "2018-12-20 10:50:48"
    },
    {
        "gameStatus": "2",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-20 10:54:09"
    },
    {
        "gameStatus": "1",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-20 11:32:04"
    }
]

---

FOR Descending order

arr.sort(function(a, b){
    var keyA = new Date(a.updated_at),
        keyB = new Date(b.updated_at);
    // Compare the 2 dates
    if(keyA > keyB) return -1;
    if(keyA < keyB) return 1;
    return 0;
});

Example for Desc Order

[
    {
        "gameStatus": "1",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-20 11:32:04"
    },
    {
        "gameStatus": "2",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-20 10:54:09"
    },
    {
        "gameStatus": "1",
        "userId": "7118ed61-d8d9-4098-a81b-484158806d21",
        "created_at": "2018-12-20 10:50:48"
    },
    {
        "gameStatus": "0",
        "userId": "1a2fefb0-5ae2-47eb-82ff-d1b2cc27875a",
        "created_at": "2018-12-19 18:46:22"
    },
    {
        "gameStatus": "2",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 18:35:40"
    },
    {
        "gameStatus": "0",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 18:08:24"
    },
    {
        "gameStatus": "0",
        "userId": "c02cfb18-ae66-430b-9524-67d9dd8f6a50",
        "created_at": "2018-12-19 10:42:53"
    }
]

Answer 3

You can create a closure and pass it that way here is my example working

$.get('https://data.seattle.gov/resource/3k2p-39jp.json?$limit=10&$where=within_circle(incident_location, 47.594972, -122.331518, 1609.34)', 
  function(responce) {

    var filter = 'event_clearance_group', //sort by key group name
    data = responce; 

    var compare = function (filter) {
        return function (a,b) {
            var a = a[filter],
                b = b[filter];

            if (a < b) {
                return -1;
            } else if (a > b) {
                return 1;
            } else {
                return 0;
            }
        };
    };

    filter = compare(filter); //set filter

    console.log(data.sort(filter));
});

Answer 4

You could use the Lodash utility library to solve this problem (it's quite an efficient library):

const data = [{
    "updated_at": "2012-01-01T06:25:24Z",
    "foo": "bar"
  },
  {
    "updated_at": "2012-01-09T11:25:13Z",
    "foo": "bar"
  },
  {
    "updated_at": "2012-01-05T04:13:24Z",
    "foo": "bar"
  }
]

const ordered = _.orderBy(
  data,
  function(item) {
    return item.updated_at;
  }
);

console.log(ordered)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

You can find documentation here: https://lodash.com/docs/4.17.15#orderBy

Answer 5

• Use Array.sort() to sort an array
• Clone array using spread operator (…) to make the function pure
• Sort by desired key (updated_at)
• Convert date string to date object
• Array.sort() works by subtracting two properties from current and next item if it is a number / object on which you can perform arrhythmic operations

const input = [
  {
    updated_at: '2012-01-01T06:25:24Z',
    foo: 'bar',
  },
  {
    updated_at: '2012-01-09T11:25:13Z',
    foo: 'bar',
  },
  {
    updated_at: '2012-01-05T04:13:24Z',
    foo: 'bar',
  }
];

const sortByUpdatedAt = (items) => [...items].sort((itemA, itemB) => new Date(itemA.updated_at) - new Date(itemB.updated_at));

const output = sortByUpdatedAt(input);

console.log(input);
/*
[ { updated_at: '2012-01-01T06:25:24Z', foo: 'bar' }, 
  { updated_at: '2012-01-09T11:25:13Z', foo: 'bar' }, 
  { updated_at: '2012-01-05T04:13:24Z', foo: 'bar' } ]
*/
console.log(output)
/*
[ { updated_at: '2012-01-01T06:25:24Z', foo: 'bar' }, 
  { updated_at: '2012-01-05T04:13:24Z', foo: 'bar' }, 
  { updated_at: '2012-01-09T11:25:13Z', foo: 'bar' } ]
*/

Answer 6

You can use Array.sort.

Here's an example:

var arr = [{
    "updated_at": "2012-01-01T06:25:24Z",
    "foo": "bar"
  },
  {
    "updated_at": "2012-01-09T11:25:13Z",
    "foo": "bar"
  },
  {
    "updated_at": "2012-01-05T04:13:24Z",
    "foo": "bar"
  }
]

arr.sort(function(a, b) {
  var keyA = new Date(a.updated_at),
    keyB = new Date(b.updated_at);
  // Compare the 2 dates
  if (keyA < keyB) return -1;
  if (keyA > keyB) return 1;
  return 0;
});

console.log(arr);