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 object1 = { property1: 42, }; Reflect.deleteProperty(object1, "property1"); console.log(object1.property1); // Expected output: undefined const array1 = [1, 2, 3, 4, 5]; Reflect.deleteProperty(array1, "3"); console.log(array1); // Expected output: Array [1, 2, 3, <1 empty slot>, 5] Syntax
Reflect.deleteProperty(target, propertyKey) Parameters
targetThe target object on which to delete the property.
propertyKeyThe name of the property to be deleted.
Return value
A boolean indicating whether or not the property was successfully deleted.
Exceptions
TypeErrorThrown 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® 2026 Language Specification # sec-reflect.deleteproperty |
