Sorting associative array / javascript object by keys alphabetically

Question

How do i order this object by the keys, Alphabetically?

I tried:

racks.sort();

The object racks is filled like this:

(Statdev is a string, and kartnr and bitnrk are integers)

racks[jPunten[i].STATDEV] = {
                            label: '',
                            punkt: [{
                            x: jPunten[i].KARTNR,
                            y: jPunten[i].BITNRK}]

Some Firebug output (i also noticed that in firebug the object IS ordered alphabetically):

racks
    []

DAY
    Object { punkt=[8], label=""}

label
    ""

punkt
    [Object { x="12", y="1"}, Object { x="12", y="2"}, Object { x="12", y="3"}, 5 meer...]

0
    Object { x="12", y="1"}

1
    Object { x="12", y="2"}

2
    Object { x="12", y="3"}

3
    Object { x="12", y="4"}

4
    Object { x="12", y="5"}

5
    Object { x="12", y="6"}

6
    Object { x="12", y="7"}

7
    Object { x="12", y="8"}

LSF01
    Object { punkt=[1], label=""}

label
    ""

punkt
    [Object { x="1", y="10"}]

0
    Object { x="1", y="10"}

x
    "1"

y
    "10"

There is no inherent order in JavaScript objects. If you need a reliable sorting, create an array of keys and sort that. — Sirko
– Sirko, Commented Nov 14, 2013 at 13:07
You can't sort objects. They are sorted by key names automatically (in most cases). — Artyom Neustroev
– Artyom Neustroev, Commented Nov 14, 2013 at 13:07

dolzhenko · Accepted Answer · 2013-11-14 13:12:07Z

2

In JavaScript impossible to sort object properties by keys. If you need it, you can put to array all keys of object, to sort them and then work with properties in desired order.

answered Nov 14, 2013 at 13:12

dolzhenko

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Comments

Mykyta Shyrin · Accepted Answer · 2013-11-14 13:15:00Z

1

Try this:

sort = function(obj, comparator) {
    var array = [];
    for (var i in obj) {
        array.push([obj[i], i]);
    }
    array.sort(function(o1, o2) {
        return comparator(o1[0], o2[0]);
    });
    var newObj = {};
    for (var i = 0; i < array.length; i++) {
        newObj[array[i][1]] = array[i][0];
    }
    return newObj;
}

answered Nov 14, 2013 at 13:15

Mykyta Shyrin

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1 Comment

Rubicksman Over a year ago

What is the comparator? Can you give an example?

Brian Lewis · Accepted Answer · 2014-12-11 22:07:22Z

0

Do two arrays:

one array for the keys
the second associative array, using the key value pair, is actually an object.

// normal object notation

var personObject = {firstName:"John", lastName:"Doe"};
alert('personObject.firstName - ' + personObject.firstName);

// add to object using object-array notation, note: doing this will convert an array to an object

personObject["age"] = 46;

// array of keys, sorted

var keysArray = ["firstName", "lastName"];
keysArray[keysArray.length] = "age";
keysArray.sort();

// get object value, using array-object notation with array as key

alert('personObject[keysArray[0]] - ' + personObject[keysArray[0]]);

answered Dec 11, 2014 at 22:07

Brian Lewis

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