JavaScript Reflect.isExtensible() MethodThe static Reflect.isExtensible() method is used to check if an object is extended or not. This method is similar to Object.isExtensible() but with some difference. Syntax:Parameters:Obj: It is the target object which to check if it is extensible. Return value:This method returns a Boolean which indicates whether or not the target is extensible. Exceptions:A TypeError, if the target is not an Object. Browser Support:
Example 1Output: true false Example 2Output: false false Example 3Output: true false
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