Deleting an entire object in Javascript

Question

arr = [
 {
   id:1
 },
 {
   id:2
 }
]

This is an example object structure. I want to delete first object in this array.

 delete arr[0];

Resulting structure is

[
{
  undefined * 1
},
{
  id:2
}
]

I have searched a lot and found that deleting an entire object will lead to dangling pointer problems. But i want resulting array to have only one object after deletion. Is there any other way to achieve this?

EDIT How to do if the object is neither first nor last?

Reason for downvoting pls. coz of duplicate? Which one is the duplicated copy — Gibbs, Nov 12 '14 at 11:52

score 2 · Answer 1 · answered Nov 12 '14 at 11:42

2

You need to create a shorter array instead. To remove the first element, just slice the array:

arr = arr.slice(1);

When the previous array is discarded the first element will also be discarded.

answered Nov 12 '14 at 11:42

iCollect.it Ltd

92,391
25
181
202

score 1 · Answer 2 · answered Nov 12 '14 at 11:42

1

The only way to delete anything from an array is to resize it

arr = arr.slice(1)

answered Nov 12 '14 at 11:42

James

80,725
18
167
237

score 1 · Accepted Answer · answered Nov 12 '14 at 11:44

You could, as an alternative to Array.prototype.slice(), use array.prototype.shift(), which simply removes the first element of the array:

arr = [
 {
   id:1
 },
 {
   id:2
 }
];

console.log(arr); // [Object, Object]

arr.shift();

console.log(arr); // [Object]

References:

Deleting an entire object in Javascript

3 Answers3