JavaScript handler getOwnPropertyDescriptor() Method

by Online Tutorials Library July 22, 2022

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

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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JavaScript handler getOwnPropertyDescriptor() Method

JavaScript handler.getOwnPropertyDescriptor() Method

Syntax

Parameters

Return value

Browser Support

Example 1

Example 2

Example 3

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