从数组中删除对象

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

Answer 1

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}

Answer 2

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

Answer 3

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