Reindex javascript array / object after removing a key

Question

For example:

var Cars = {
    1: { "Make": "Honda",
         "Model": "Accord",
         "Color": "Red"
    },
    2: { "Make": "Honda",
         "Model": "Civic",
         "Color": "Silver"
    },
    3: { "Make": "Honda",
         "Model": "Jazz",
         "Color": "Yellow"
    }

If I do a delete.Cars[2]; I will be left with Cars[1] and Cars[3].

I need a way (JS or jQuery) so that when I delete a key, the object reindexes. So, in the example above, I'm left with Cars[1] and Cars[2] (which was Cars[3]).

If you use an array, this question has your answer- http://stackoverflow.com/questions/500606/javascript-array-delete-elements — Richard Dalton, Nov 29 '11 at 12:01
Because you can't have multiple dimensions, I've just checked. — joedborg, Nov 29 '11 at 12:01
You can have an array of arrays, or an array of objects. (So wherever you checked didn't give all the information.) — nnnnnn, Nov 29 '11 at 12:03
That fiddle isn't an array, it's invalid syntax. Look at this: http://jsfiddle.net/vfaZt/1/ and then read up on the Array [`.splice`](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/splice) method. — nnnnnn, Nov 29 '11 at 12:10
I gathered that... by putting in a jsfiddle, I'm asking for a resolution. — joedborg, Nov 29 '11 at 12:12

score 7 · Accepted Answer · answered Nov 29 '11 at 12:12

7

That is because you dont need the keys for the array.

var Cars = [
    {
        "Make": "Honda",
        "Model": "Accord",
        "Color": "Red"
    },{
        "Make": "Honda",
        "Model": "Civic",
        "Color": "Silver"
    },{
        "Make": "Honda",
        "Model": "Jazz",
        "Color": "Yellow"
    }
];

alert(Cars[1]['Make']); // Honda

answered Nov 29 '11 at 12:12

Elzo Valugi

27,240
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But if I have array like this [ {key:"label", sortable:true, resizeable:true}, {key:"notes", sortable:true,resizeable:true},...... After shift it starts at second param. With index = 1 – fdrv Mar 16 '16 at 23:13

score 4 · Answer 2 · edited May 23 '17 at 10:30

4

You can have a look at this:

Array: Javascript - Reindexing an array

Object: Algorithm to re-index an array of objects after insertion or drag 'n' drop order change

It should do the trick :)

Referencing other developers in this thread, and myself, it will be better to use an Array.

edited May 23 '17 at 10:30

Community

1
1

answered Nov 29 '11 at 12:01

Marc Uberstein

12,501
3
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1

Not. Stop using them and use Array instead. (Well, in fact, it can help, if you do `Array.prototype.splice.call(theStrangeObject, 2, 1)` instead of `delete theStrangeObject[2]`... but no, it does not help, you have no `length` there. Use Array). – Nov 29 '11 at 12:17

Reindex javascript array / object after removing a key

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