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JavaScript Reflect getOwnPropertyDescriptor() Method

JavaScript Reflect getOwnPropertyDescriptor() 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.getOwnPropertyDescriptor() Method

The static Reflect.getOwnPropertyDescriptor() method is used to retrieve the descriptor of an object's property. It is same as the Object.getOwnPropertyDescriptor method.

Syntax:

Reflect.getOwnPropertyDescriptor (obj,  Key)

Parameters:

Obj: It is the target object in which to look for the property.

Key: It is the name of the property to get an own property descriptor for.

Return value:

It returns the property descriptor object if the property exists in the given target object. Otherwise, it returns undefined.

Exceptions:

A TypeError, if the target is not an Object.

Browser Support:

Chrome 49
Edge 12
Firefox 42
Opera 36

Example 1

const object1 = {
  property1: 22    };
console.log(Reflect.getOwnPropertyDescriptor(object1, 'property2'));
console.log(Reflect.getOwnPropertyDescriptor(object1, 'property1').writable);

Output:

undefined
 true

Example 2

const object1 = {
  property1: 234    };
const hh = {p:4};
console.log(Reflect.getOwnPropertyDescriptor(object1, 'property1').value);

console.log(Reflect.getOwnPropertyDescriptor(object1, 'property2'));

console.log(Reflect.getOwnPropertyDescriptor(object1, 'property1').writable);

console.log (
 Reflect.getOwnPropertyDescriptor ( hh , "yyy" ) === undefined
);

Output:

234
Undefined
true
true

Example 3

const object1 = {
  property1: 42
};
console.log(Reflect.getOwnPropertyDescriptor(object1, 'property1').value);

console.log(Reflect.getOwnPropertyDescriptor(object1, 'property2'));

console.log(Reflect.getOwnPropertyDescriptor(object1, 'property1').enumerable);

Output:

42
undefined
true
Next TopicJavaScript Reflect




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