remove object from an array

Question

I have an array with the following structure :

var y = [{id:12,count:10}, {id:23,count:89}, {id:21,count:100},]

How can I remove element with id:23 ?

I am not willing to use to create a prototype method on the array Array.prototype.remove

Any pointers appreciated

Thanks

possible duplicate of How do I remove an object from an array with JavaScript? and stackoverflow.com/questions/6891329/… — Felix Kling
– Felix Kling, Commented Apr 24, 2012 at 18:23

jAndy · Accepted Answer · 2012-04-24 18:21:36Z

5

ES5 code:

y = y.filter(function( obj ) {
    return obj.id !== 23;
});

^{ES5 is widely supported by all major browsers. Still, you might want to include on of the several Shims to backup old'ish browsers}

answered Apr 24, 2012 at 18:21

jAndy

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Denis Ermolin · Accepted Answer · 2012-04-24 18:22:10Z

3

for (i in y) {
    if (y[i].id == 23) {
       y.splice(i, 1);
       break;
    }
}

answered Apr 24, 2012 at 18:22

Denis Ermolin

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7 Comments

quodlibetor Over a year ago

if it's possible for there to be two elements with the matching id then this could fail (if they dups are in sequence), and if there is only one then there should be a break inside the if block.

jAndy Over a year ago

its pretty bad to use a for in to iterate over an array. You might end up iterating methods/functions or propertys on the Array aswell. Better use a standard for loop.

Denis Ermolin Over a year ago

In all major browsers variable i will never have property name of Array object.

Elias Van Ootegem Over a year ago

@DenisErmolin: on what grounds are you making that claim?

jAndy Over a year ago

Very good question. That is just wrong.. of course ANY browser will list the object properties aswell. Easy example: var foo = [1,2,3]; foo.IAMBOSSBITCH = true; loop over that...

|

Elias Van Ootegem · Accepted Answer · 2012-04-24 18:29:15Z

0

Denis Ermolin's answer is an option, though a few problems might occur, here's what I suggest:

for(var i=0;i<y.length;i++)
{
    if (y[i].hasOwnProperty('id') && y[i].id === 23)
    {
        delete(y[i]);
        break;
    }
}

When using arrays, it's always better to avoid the for - in loop, as this will loop through the Array.prototype, so i might suddenly contain length, not an index number.

When you're dealing with objects, the for in loop is a great thing, but again: it loops through the prototypes, that's why you're better off using the hasOwnProperty method.

The rest is pretty strait forward, I think... good luck

answered Apr 24, 2012 at 18:29

Elias Van Ootegem

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