delete
Removes a property from an object.
Syntax
delete object.prop
delete object[key]
Returns
boolean — `true` if the property was deleted or did not exist; `false` if the
property is non-configurable.
Examples
const obj = { a: 1, b: 2 };
delete obj.a;
console.log(obj);
Output
{ b: 2 }
const obj = { x: 1 };
console.log(delete obj.x);
console.log(delete obj.missing);
Output
true
true
const arr = [1, 2, 3];
delete arr[1];
console.log(arr);
console.log(arr.length);
Output
[ 1, <1 empty item>, 3 ]
3
Notes
- Deleting an array element leaves a hole; it does not reindex or change
`length`. Use `splice()` to remove elements.
- `delete` only removes own properties, not inherited ones.
- It cannot delete variables or non-configurable properties.
Browser & runtime support
| Environment | Since version |
|---|---|
| chrome | 1.0 |
| firefox | 1.0 |
| safari | 1.0 |
| edge | 12 |
| node | 0.10 |