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JavaScript handler getOwnPropertyDescriptor() Method

JavaScript handler getOwnPropertyDescriptor() Method with examples on javascript handler, javascript methods, javascript tutorial, apply(), construct(), defineProperty(), deleteProperty(), get(), setPrototypeOf(), set(), ownKeys(), isExtensible() etc.

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JavaScript handler.getOwnPropertyDescriptor() Method

The handler.getOwnPropertyDescriptor() method is a trap for Object.getOwnPropertyDescriptor(). It exists as an own property of the target object and the target object is not extensible.

Syntax

getOwnPropertyDescriptor: function(target, prop)

Parameters

Target: The target object.

Prop: The name of the property whose description should be retrieved.

Return value

This method returns an object or undefined.

Browser Support

Chrome 49
Edge 12
Firefox 18
Opera 36

Example 1

const proxy = new Proxy({}, {
  getOwnPropertyDescriptor: function(target, name) {
  document.writeln('Java Script is a scripting language');
    //expected output: Java Script is a scripting language
 return Object.getOwnPropertyDescriptor(target, name);
  }
});
console.dir(Object.getOwnPropertyDescriptor(proxy, 'foo'));
Test it Now

Output:

Java Script is a scripting language

Example 2

const r={}
const p = new Proxy(r, {
  getOwnPropertyDescriptor: function(target, prop) {
  document.write('Value : ' + prop);
    return { configurable: true, enumerable: true, value: 10 };
  }
});
document.writeln(Object.getOwnPropertyDescriptor(p, 'abc ').value);
Test it Now

Output:

Value : abc 10

Example 3

var a = {
  eyeCount: 3
}

var b = {
  getOwnPropertyDescriptor(target, prop) {
    
   document.writeln(`Java Script proxt : ${prop}`);
    
    
    return { configurable: true, value: 50};
  }
};
const c= new Proxy(a, b);
document.writeln(Object.getOwnPropertyDescriptor(c, 'Own property').value);
Test it Now

Output:

Java Script proxt : Own property 50

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