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Reflect.getPrototypeOf()

main Documentación oficial Licencia CC-BY-SA-2.5Descargado el 2026-08-02

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The Reflect.getPrototypeOf() static method is like {{jsxref("Object.getPrototypeOf()")}}. It returns the prototype of the specified object.

{{InteractiveExample("JavaScript Demo: Reflect.getPrototypeOf()")}}

```js interactive-example const object = { foo: 42, };

const proto = Reflect.getPrototypeOf(object);

console.log(proto); // Expected output: Object { }

console.log(Reflect.getPrototypeOf(proto)); // Expected output: null

## Syntax

```js-nolint
Reflect.getPrototypeOf(target)

Parameters#

  • target
  • : The target object of which to get the prototype.

Return value#

The prototype of the given object, which may be an object or null.

Exceptions#

  • {{jsxref("TypeError")}}
  • : Thrown if target is not an object.

Description#

Reflect.getPrototypeOf() provides the reflective semantic of retrieving the prototype of an object. The only difference with {{jsxref("Object.getPrototypeOf()")}} is how non-object targets are handled. Reflect.getPrototypeOf() throws a {{jsxref("TypeError")}} if the target is not an object, while Object.getPrototypeOf() coerces it to an object.

Reflect.getPrototypeOf() invokes the [[GetPrototypeOf]] object internal method of target.

Examples#

Using Reflect.getPrototypeOf()#

Reflect.getPrototypeOf({}); // Object.prototype
Reflect.getPrototypeOf(Object.prototype); // null
Reflect.getPrototypeOf(Object.create(null)); // null

Difference with Object.getPrototypeOf()#

// Same result for Objects
Object.getPrototypeOf({}); // Object.prototype
Reflect.getPrototypeOf({}); // Object.prototype

// Both throw in ES5 for non-Objects
Object.getPrototypeOf("foo"); // Throws TypeError
Reflect.getPrototypeOf("foo"); // Throws TypeError

// In ES2015 only Reflect throws, Object coerces non-Objects
Object.getPrototypeOf("foo"); // String.prototype
Reflect.getPrototypeOf("foo"); // Throws TypeError

// To mimic the Object ES2015 behavior you need to coerce
Reflect.getPrototypeOf(Object("foo")); // String.prototype

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#