JavaScript Reflect defineProperty() Method Last Updated : 07 Aug, 2023 Comments Improve Suggest changes Like Article Like Report JavaScript Reflect.defineProperty() method in JavaScript is used to allow the precise addition to or modification of a property on an object. This method returns a Boolean value which indicates whether the property was successfully defined. Syntax: Reflect.defineProperty(target, propertyKey, attributes) Parameter: This method accepts three parameters as mentioned above and described below: target: This parameter defines the property and the target object.propertyKey: This parameter is the name of the property which is to be defined or modified.Attributes: This parameter is the attributes for the property which is being defined or modified.Return value: This method returns a Boolean value which indicates whether the property was successfully defined. Exceptions: A TypeError is an exception given as the result when the target is not an Object. Below examples illustrate the Reflect.defineProperty() method in JavaScript: Example 1: The below example shows the basic use of the Reflect.defineProperty() method in JavaScript. javascript const object1 = {}; if (Reflect.defineProperty(object1, 'geeks1', { value: 42 })) { console.log('geeks1 assigned'); } else { console.log('problem created by geeks1'); } console.log(object1.geeks1); const object2 = {}; const object3 = {}; (Reflect.defineProperty(object2, 'geeks2', { value: 97 })) if (Reflect.defineProperty(object3, 'geeks3', { value: 23 })) { console.log('geeks3 assigned'); } else { console.log('problem created by geeks3'); } console.log(object3.geeks3); console.log(object2.geeks2); Outputgeeks1 assigned 42 geeks3 assigned 23 97 Example 2: The below example shows the basic use of the Reflect.defineProperty() method in JavaScript. javascript const a = {}; const result = Reflect.defineProperty(a, "geek1", { value: 19, }); console.log(a); console.log(result); const b = {}; const result1 = Reflect.defineProperty(b, "geek2", { value: 56, writable: false } ); console.log(b); console.log(result1); let obj = {} Reflect.defineProperty(obj, 'x', { value: 71 }) // true console.log(obj.x) Output{} true {} true 71 Supported Browsers: The browsers are supported by JavaScript Reflect.defineProperty() Method are listed below: Google Chrome 49 and aboveEdge 12 and aboveFirefox 42 and aboveOpera 36 and aboveSafari 10 and aboveWe have a complete list of Javascript Reflects methods, to check those go through the JavaScript Reflect Reference article. Comment More infoAdvertise with us Next Article JavaScript Reflect deleteProperty() Method S SHUBHAMSINGH10 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Methods JavaScript-Reflect Similar Reads JavaScript Reflect apply() Method Javascript Reflect.apply() method is a standard build-in object in JavaScript which is used to call a function using the specified argument. It works similar to the Function.prototype.apply() method to call a function, but in an efficient manner and easy to understand. Syntax: Reflect.apply(target, 2 min read JavaScript Reflect construct() Method JavaScript Reflect.construct() method in JavaScript is used to call a new target. It gives also the added option to specify a different prototype. Syntax: Reflect.construct(para1, para2, para3)Parameters: This method accepts three parameters as mentioned above and described below: para1: This parame 2 min read JavaScript Reflect defineProperty() Method JavaScript Reflect.defineProperty() method in JavaScript is used to allow the precise addition to or modification of a property on an object. This method returns a Boolean value which indicates whether the property was successfully defined. Syntax: Reflect.defineProperty(target, propertyKey, attribu 2 min read JavaScript Reflect deleteProperty() Method JavaScript Reflect.deleteProperty() method in JavaScript is used to delete a property on an object. It returns a Boolean value which indicates whether the property was successfully deleted. Syntax: Reflect.deleteProperty( target, propertyKey ) Parameters: This method accepts two parameters as mentio 2 min read JavaScript Reflect get() Method JavaScript Reflect.get() method in JavaScript is used to allow users to get the property from an object as a function. This method always returns the value of the property. Syntax: Reflect.get(target, propertyKey, receiver) Parameters: This method accepts three parameters as mentioned above and desc 2 min read JavaScript Reflect getOwnPropertyDescriptor() Method JavaScript Reflect.getOwnPropertyDescriptor() method in Javascript is used to get the descriptor of an object if it exists in the object. It is the same as the Object.getOwnPropertyDescriptor method, but non-object targets are handled differently. Syntax: Reflect.getOwnPropertyDescriptor(obj, Key) P 2 min read JavaScript Reflect getPrototypeOf() Method JavaScript Reflect.getPrototypeOf() method in JavaScript is used to return the prototype of the specified object. Syntax: Reflect.getPrototypeOf( obj ) Parameters: This method accepts a single parameter as mentioned above and described below: obj: This parameter is the target object and it is used t 2 min read JavaScript Reflect has() Method JavaScript Reflect.has() method in JavaScript is used to check whether the property exists in an object or not. It works like the in operator as a function. Syntax: Reflect.has(target, propertyKey) Parameters: This method accepts two parameters as mentioned above and described below: target: This pa 2 min read JavaScript Reflect isExtensible() Method JavaScript Reflect.isExtensible() method in JavaScript is used to check whether an object is extensible or not(Checks whether other properties can be added to it or not). This method is similar to Object.isExtensible() but it will cause a TypeError if the target is not an object. Syntax: Reflect.isE 2 min read JavaScript Reflect ownKeys() Method JaScript Reflect.ownKeys() method in Javascript is used to return an array of the target object's own property keys and it ignores the inherited properties. Syntax: Reflect.ownKeys( obj ) Parameters: This method accepts a single parameter as mentioned above and described below: Obj: This parameter h 2 min read Like