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    Object.getPrototypeOf()

    Summary

    The Object.getPrototypeOf() method returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.

    Syntax

    Object.getPrototypeOf(obj)

    Parameters

    obj
    The object whose prototype is to be returned.

    Examples

    var proto = {};
    var obj = Object.create(proto);
    Object.getPrototypeOf(obj) === proto; // true
    

    Notes

    In ES5, it will throw a TypeError exception if the obj parameter isn't an object. In ES6, the parameter will be coerced to an Object.

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

    Specifications

    Specification Status Comment
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Object.getPrototypeOf' in that specification.
    Standard Initial definition.
    ECMAScript 6 (ECMA-262)
    The definition of 'Object.getProtoypeOf' in that specification.
    Release Candidate  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 5 3.5 (1.9.1) 9 12.10 (maybe earlier) 5
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support ? ? ? ? ? ?

    Based on Kangax's compat table.

    Opera-specific notes

    Even though older Opera versions don't support Object.getPrototypeOf() yet, Opera supports the non-standard __proto__ property since Opera 10.50.

    See also

    Document Tags and Contributors

    Last updated by: kdex,