JavaScript Reflect defineProperty() Method

by Online Tutorials Library July 22, 2022

JavaScript Reflect.defineProperty() Method

The static method Reflect.defineProperty() allows the precise addition to or modification of a property on an object. The Reflect.defineProperty() method returns a Boolean value which indicates that whether or not the property was successfully defined.

Syntax

Parameter

target: It is the target object which defines the property.

propertyKey: It is the name of the property to be defined or modified.

Attributes: It is the attributes for the property being defined or modified.

Return value:

This method returns a Boolean value which indicates that whether or not the property was successfully defined.

Exceptions

This exception will throw a TypeError if the target is not an Object.

Example 1

  const u = {};  const result = Reflect.defineProperty(u, “p”,  { value : 6,});  console.log( u );   

Output:

Object {  }

Example 2

  const u = {};  const su = Reflect.defineProperty(u, “p”,  { value : 3,    writable: true,   //write    // enumerable: true,   //configurable: true  }  );  console.log( u );  console.log( su);  

Output:

 Object {  }    true

Example 3

  const object1 = {};  const object2 = {};  (Reflect.defineProperty(object2, ‘property2’, {value: 12}))  if (Reflect.defineProperty(object1, ‘property1’, {value: 42})) {    console.log(‘property1 created!’);  } else {    console.log(‘problem creating property1’);  }  console.log(object1.property1);  console.log(object2.property2);  

Output:

 "property1 created!"    42    12

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JavaScript Reflect defineProperty() Method

JavaScript Reflect.defineProperty() Method

Syntax

Parameter

Return value:

Exceptions

Example 1

Example 2

Example 3

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