Reflect.getOwnPropertyDescriptor()

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

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 in target object; otherwise, undefined.

Exceptions

A TypeError, if target is not an Object.

Description

The Reflect.getOwnPropertyDescriptor method returns a property descriptor of the given property if it exists in the target object, undefined otherwise. The only difference to Object.getOwnPropertyDescriptor() is how non-object targets are handled.

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 to 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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
getOwnPropertyDescriptor
49
12
42
No
36
10
49
49
42
36
10
5.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Reflect/getOwnPropertyDescriptor