Reflect.deleteProperty()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
The Reflect.deleteProperty() static method is like the delete operator, but as a function. It deletes a property from an object.
Try it
const object = {
foo: 42,
};
Reflect.deleteProperty(object, "foo");
console.log(object.foo);
// Expected output: undefined
const array = [1, 2, 3, 4, 5];
Reflect.deleteProperty(array, "3");
console.log(array);
// Expected output: Array [1, 2, 3, <1 empty slot>, 5]
Syntax
Reflect.deleteProperty(target, propertyKey)
Parameters
target-
The target object on which to delete the property.
propertyKey-
The name of the property to be deleted.
Return value
A boolean indicating whether or not the property was successfully deleted.
Exceptions
TypeError-
Thrown if
targetis not an object.
Description
Reflect.deleteProperty() provides the reflective semantic of the delete operator. That is, Reflect.deleteProperty(target, propertyKey) is semantically equivalent to:
delete target.propertyKey;
At the very low level, deleting a property returns a boolean (as is the case with the proxy handler). Reflect.deleteProperty() directly returns the status, while delete would throw a TypeError in strict mode if the status is false. In non-strict mode, delete and Reflect.deleteProperty() have the same behavior.
Reflect.deleteProperty() invokes the [[Delete]] object internal method of target.
Examples
Using Reflect.deleteProperty()
const obj = { x: 1, y: 2 };
Reflect.deleteProperty(obj, "x"); // true
console.log(obj); // { y: 2 }
const arr = [1, 2, 3, 4, 5];
Reflect.deleteProperty(arr, "3"); // true
console.log(arr); // [1, 2, 3, <1 empty slot>, 5]
// Returns true if no such property exists
Reflect.deleteProperty({}, "foo"); // true
// Returns false if a property is unconfigurable
Reflect.deleteProperty(Object.freeze({ foo: 1 }), "foo"); // false
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-reflect.deleteproperty |
Browser compatibility
| desktop | mobile | server | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
deleteProperty
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support