writableProperties
Return an array of an object's own writable property names and symbols.
Usage
var writableProperties = require( '@stdlib/utils/writable-properties' );
writableProperties( obj )
Returns an array
of an object's own writable property names and symbols.
var obj = {
'a': 1,
'b': 2
};
var props = writableProperties( obj );
// e.g., returns [ 'a', 'b' ]
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 anobject
'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 writableProperties = require( '@stdlib/utils/writable-properties' );
var 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.c = 'c';
if ( hasSymbols ) {
Foo.prototype[ Symbol( 'c' ) ] = 'c';
}
var obj = new Foo();
var props = writableProperties( obj );
// e.g., returns [ 'a', ... ]