Reflect.getPrototypeOf()

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

Syntax

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

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 Object.getPrototypeOf is how non-object targets are handled. Reflect.getPrototypeOf() throws a TypeError if the target is not an object, while Object.getPrototypeOf() coerces it to an object.

Reflect.getPrototypeOf() invokes the <span class="selflink">GetPrototypeOf</span> 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