writable-property-symbols-in

writablePropertySymbolsIn

Return an array of an object's own and inherited writable symbol properties.

Usage

var writablePropertySymbolsIn = require( '@stdlib/utils/writable-property-symbols-in' );

writablePropertySymbolsIn( obj )

Returns an array of an object's own and inherited writable symbol properties.

var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
var Symbol = require( '@stdlib/symbol/ctor' );
var defineProperty = require( '@stdlib/utils/define-property' );

var obj = {};

if ( hasSymbolSupport() ) {
    defineProperty( obj, Symbol( 'a' ), {
        'configurable': false,
        'enumerable': false,
        'writable': true,
        'value': 'b'
    });
}

var symbols = writablePropertySymbolsIn( obj );

Notes

• Property order is not guaranteed, as object property enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort an object's properties, thus allowing for deterministic extraction.

Examples

var defineProperty = require( '@stdlib/utils/define-property' );
var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
var Symbol = require( '@stdlib/symbol/ctor' );
var writablePropertySymbolsIn = require( '@stdlib/utils/writable-property-symbols-in' );

var hasSymbols = hasSymbolSupport();
var symbols;
var obj;

function Foo() {
    if ( hasSymbols ) {
        defineProperty( this, Symbol( 'baz' ), {
            'configurable': false,
            'enumerable': false,
            'writable': true,
            'value': 'qux'
        });
    }
    return this;
}

if ( hasSymbols ) {
    defineProperty( Foo.prototype, Symbol( 'bip' ), {
        'configurable': false,
        'enumerable': false,
        'writable': true,
        'value': 'bop'
    });
}

obj = new Foo();
symbols = writablePropertySymbolsIn( obj );

console.log( symbols );

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See Also

• @stdlib/utils/inherited-writable-property-symbols: return an array of an object's inherited writable symbol properties.
• @stdlib/utils/writable-properties-in: return an array of an object's own and inherited writable property names and symbols.
• @stdlib/utils/writable-property-names-in: return an array of an object's own and inherited writable property names.
• @stdlib/utils/writable-property-symbols: return an array of an object's own writable symbol properties.
• @stdlib/utils/property-symbols-in: return an array of an object's own and inherited symbol properties.