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JavaScript Reflect isExtensible() Method

JavaScript Reflect isExtensible() Method with examples on javascript reflect methods, apply() construct(), defineProperty() method, deleteProperty(), get(), getOwnPropertyDescriptor(), getPrototypeOf(), has(), isExtensible(), ownKeys(), setPrototypeOf() etc.

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JavaScript Reflect.isExtensible() Method

The 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:

Reflect.isExtensible(obj)

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:

Chrome 49
Edge 12
Firefox 42
Opera 36

Example 1

const object = {};
console.log(Reflect.isExtensible(object));
Reflect.preventExtensions(object);
console.log(Reflect.isExtensible(object));

Output:

true
 false

Example 2

const object2 = Object.seal({});

console.log(Reflect.isExtensible(object2));

const object3 = Object.seal({});
console.log(Reflect.isExtensible(object3));

Output:

 false
 false

Example 3

const object = {};
const object1 = {};
console.log(Reflect.isExtensible(object1));
Reflect.preventExtensions(object);
console.log(Reflect.isExtensible(object));

Output:

true
false
Next TopicJavaScript Reflect




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