<!-- @license Apache-2.0 Copyright (c) 2018 The Stdlib Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> # writablePropertiesIn > Return an array of an object's own and inherited writable property names and [symbols][@stdlib/symbol/ctor]. <section class="usage"> ## Usage ```javascript var writablePropertiesIn = require( '@stdlib/utils/writable-properties-in' ); ``` #### writablePropertiesIn( obj ) Returns an `array` of an object's own and inherited writable property names and [symbols][@stdlib/symbol/ctor]. ```javascript var defineProperty = require( '@stdlib/utils/define-property' ); var obj = {}; defineProperty( obj, 'a', { 'configurable': false, 'enumerable': false, 'writable': true, 'value': 'a' }); var props = writablePropertiesIn( obj ); // returns [ 'a', ... ] ``` </section> <!-- /.usage --> <section class="notes"> </section> <!-- /.notes --> <section class="examples"> ## Examples <!-- eslint no-undef: "error" --> ```javascript var defineProperty = require( '@stdlib/utils/define-property' ); var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' ); var Symbol = require( '@stdlib/symbol/ctor' ); var writablePropertiesIn = require( '@stdlib/utils/writable-properties-in' ); var hasSymbols; var props; var obj; hasSymbols = hasSymbolSupport(); function Foo() { this.a = 'a'; defineProperty( this, 'b', { 'configurable': true, 'enumerable': true, 'writable': false, 'value': 'b' }); if ( hasSymbols ) { this[ Symbol( 'a' ) ] = 'a'; defineProperty( this, Symbol( 'b' ), { 'configurable': true, 'enumerable': true, 'writable': false, 'value': 'b' }); } return this; } Foo.prototype.foo = 'bar'; defineProperty( Foo.prototype, 'beep', { 'configurable': false, 'enumerable': false, 'writable': false, 'value': 'boop' }); if ( hasSymbols ) { Foo.prototype[ Symbol( 'foo' ) ] = 'bar'; defineProperty( Foo.prototype, Symbol( 'beep' ), { 'configurable': false, 'enumerable': false, 'writable': false, 'value': 'boop' }); } obj = new Foo(); props = writablePropertiesIn( obj ); console.log( props ); // e.g., => [ 'a', 'foo', ... ] ``` </section> <!-- /.examples --> <section class="links"> [@stdlib/symbol/ctor]: https://www.npmjs.com/package/@stdlib/symbol-ctor </section> <!-- /.links -->