Reflect.getOwnPropertyDescriptor()

The Reflect.getOwnPropertyDescriptor() static method is like Object.getOwnPropertyDescriptor(). It returns a property descriptor of the given property if it exists on the object, undefined otherwise.

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Syntax

Reflect.getOwnPropertyDescriptor(target, propertyKey)

Parameters

target: The target object in which to look for the property.
propertyKey: The name of the property to get an own property descriptor for.

Return value

A property descriptor object if the property exists as an own property of target; otherwise, undefined.

Exceptions

TypeError: Thrown if target is not an object.

Description

Reflect.getOwnPropertyDescriptor() provides the reflective semantic of retrieving the property descriptor of an object. The only difference with Object.getOwnPropertyDescriptor() is how non-object targets are handled. Reflect.getOwnPropertyDescriptor() throws a TypeError if the target is not an object, while Object.getOwnPropertyDescriptor() coerces it to an object.

Reflect.getOwnPropertyDescriptor() invokes the [[GetOwnProperty]] object internal method of target.

Examples

Using Reflect.getOwnPropertyDescriptor()

Reflect.getOwnPropertyDescriptor({ x: "hello" }, "x");
// {value: "hello", writable: true, enumerable: true, configurable: true}

Reflect.getOwnPropertyDescriptor({ x: "hello" }, "y");
// undefined

Reflect.getOwnPropertyDescriptor([], "length");
// {value: 0, writable: true, enumerable: false, configurable: false}

Difference with Object.getOwnPropertyDescriptor()

If the target argument to this method is not an object (a primitive), then it will cause a TypeError. With Object.getOwnPropertyDescriptor, a non-object first argument will be coerced to an object at first.

Reflect.getOwnPropertyDescriptor("foo", 0);
// TypeError: "foo" is not non-null object

Object.getOwnPropertyDescriptor("foo", 0);
// { value: "f", writable: false, enumerable: true, configurable: false }

Specifications

Specification
ECMAScript Language Specification # sec-reflect.getownpropertydescriptor

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`getOwnPropertyDescriptor`	49	12	42	36	10	49	42	36	10	5.0	49	1.0	6.0.0

Docs

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