The static Reflect.defineProperty()
method is like Object.defineProperty()
but returns a Boolean
.
Reflect.defineProperty()
Try it
Syntax
Reflect.defineProperty(target, propertyKey, attributes)
Parameters
-
target
-
The target object on which to define the property.
-
propertyKey
-
The name of the property to be defined or modified.
-
attributes
-
The attributes for the property being defined or modified.
Return value
A Boolean
indicating whether or not the property was successfully defined.
Exceptions
Description
The Reflect.defineProperty
method allows precise addition to or modification of a property on an object. For more details, see the Object.defineProperty
which is similar.
Examples
Using Reflect.defineProperty()
let obj = {} Reflect.defineProperty(obj, 'x', {value: 7}) // true obj.x // 7
Checking if property definition has been successful
With Object.defineProperty
, which returns an object if successful, or throws a TypeError
otherwise, you would use a try...catch
block to catch any error that occurred while defining a property.
Because Reflect.defineProperty
returns a Boolean success status, you can just use an if...else
block here:
if (Reflect.defineProperty(target, property, attributes)) { // success } else { // failure }
Specifications
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
defineProperty |
49
|
12
|
42
|
No
|
36
|
10
|
49
|
49
|
42
|
36
|
10
|
5.0
|
1.0
|
6.0.0
|
See also
© 2005–2022 MDN contributors.
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/defineProperty