# writablePropertiesIn
> Return an array of an object's own and inherited writable property names and [symbols][@stdlib/symbol/ctor].
## 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', ... ]
```
## Examples
```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', ... ]
```
[@stdlib/symbol/ctor]: https://www.npmjs.com/package/@stdlib/symbol-ctor