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    Object.getOwnPropertySymbols()

    This is an experimental technology, part of the Harmony (ECMAScript 6) proposal.
    Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.

    Summary

    The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object.

    Syntax

    Object.getOwnPropertySymbols(obj)

    Parameters

    obj
    The object whose symbol properties are to be returned.

    Description

    Similar to Object.getOwnPropertyNames(), you can get all symbol properties of a given object as an array of symbols. Note that Object.getOwnPropertyNames() itself does not contain the symbol properties of an object and only the string properties.

    As all objects have no own symbol properties initially, Object.getOwnPropertySymbols() returns an empty array unless you have set symbol properties on your object.

    Examples

    var obj = {};
    var a = Symbol('a');
    var b = Symbol.for('b');
    
    obj[a] = 'localSymbol';
    obj[b] = 'globalSymbol';
    
    var objectSymbols = Object.getOwnPropertySymbols(obj);
    
    console.log(objectSymbols.length); // 2
    console.log(objectSymbols);        // [Symbol(a), Symbol(b)]
    console.log(objectSymbols[0]);     // Symbol(a)
    

    Specifications

    Specification Status Comment
    ECMAScript 6 (ECMA-262)
    The definition of 'Object.getOwnPropertySymbols' in that specification.
    Draft Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) 36.0 (36.0) Not supported (Yes) Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) 36.0 (36.0) Not supported Not supported Not supported

    See also

    Document Tags and Contributors

    Contributors to this page: Mingun, realityking, fscholz
    Last updated by: fscholz,