JavaScript handler getPrototypeOf() Method

by Online Tutorials Library July 22, 2022

JavaScript handler.getPrototypeOf() Method

The handler.getPrototypeOf() method is a trap for the internal method. If target is not extensible, then this method returns the same value as Object.getPrototypeOf(target).

Syntax

Parameters

target: The target object.

Return value

This method returns an object or null.

Browser Support

Chrome	NO
Edge	NO
Firefox	49
Opera	NO

Example 1

  const obj = {};  const proto = {};  const hag = {      getPrototypeOf(target) {          document.writeln (target === obj);            document.writeln (this === hag);           return proto;      }  };  const p = new Proxy(obj, hag);  document.writeln(Object.getPrototypeOf(p) === proto);   

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Output:

true true true

Example 2

  var obj = {};  var p = new Proxy(obj, {      getPrototypeOf(target) {          return Array.prototype;      }  });  document.write(          p instanceof Array    );  

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Output:

true

Example 3

  const Prototype = {    eyeCount : 32  };  const handler = {    getPrototypeOf(target) {      return Prototype;    }  };  const obj = new Proxy(Prototype, handler);  document.writeln(Object.getPrototypeOf(obj) == Prototype);  

Test it Now

Output:

true

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JavaScript handler getPrototypeOf() Method

JavaScript handler.getPrototypeOf() Method

Syntax

Parameters

Return value

Browser Support

Example 1

Example 2

Example 3

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