Reflect.isExtensible()

The Reflect.isExtensible() static method is like Object.isExtensible(). It determines if an object is extensible (whether it can have new properties added to it).

Reflect.isExtensible() provides the reflective semantic of checking if an object is extensible. The only difference with Object.isExtensible() is how non-object targets are handled. Reflect.isExtensible() throws a TypeError if the target is not an object, while Object.isExtensible() always returns false for non-object targets.

Reflect.isExtensible() invokes the [[IsExtensible]] object internal method of target.

Return value: A Boolean indicating whether or not the target is extensible.

Parameters: target The target object which to check if it is extensible.

Syntax example: Reflect.isExtensible(target)