Reflect.preventExtentions()
The Reflect.preventExtensions() method prevents new properties
from being added to an object.
It is similar to Object.preventExtensions().
Syntax
Reflect.preventExtentions(obj)
Parameters
| Parameter | Description |
|---|---|
| obj | Required. The target object. |
Return Value
| Type | Description |
|---|---|
| Boolean |
true if prevent was successfully set. false if not. |
Errors
| Type | Description |
|---|---|
| TypeError | Thrown if obj is not an object. |
Reflect Methods:
Reflect.apply()
Reflect.construct()
Reflect.defineProperty()
Reflect.deleteProperty()
Reflect.get()
Reflect.getOwnPropertyDescriptor()
Reflect.getPrototypeOf()
Reflect.has()
Reflect.isExtensible()
Reflect.ownKeys()
Reflect.preventExtensions()
Reflect.set()
Reflect.setPrototypeOf()
Browser Support
Reflect.preventExtentions() is an ECMAScript6 (ES6 2015) feature.
JavaScript 2015 is supported in all browsers since June 2017:
| Chrome 51 |
Edge 15 |
Firefox 54 |
Safari 10 |
Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |
