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  5. Object
  6. Object.getPrototypeOf()
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Object.getPrototypeOf()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..

Object.getPrototypeOf() ( , [[Prototype]]) .

In this article

Object.getPrototypeOf(obj)

obj

, .

js
var proto = {};
var obj = Object.create(proto);
Object.getPrototypeOf(obj) === proto; // true
js
> Object.getPrototypeOf('foo')
TypeError: "foo" is not an object  //  ES5
> Object.getPrototypeOf('foo')
String.prototype                   //  ES6

ES5, obj , TypeError. ES6, Object.

js
> Object.getPrototypeOf('foo')
TypeError: "foo" is not an object  //  ES5
> Object.getPrototypeOf('foo')
String.prototype                   //  ES6

Specification
ECMAScript 2027 LanguageSpecification
# sec-object.getprototypeof

Opera

Opera Object.getPrototypeOf(), Opera Object.prototype.__proto__, Opera 10.50.

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