Return an array of an object's own writable property names.
var writablePropertyNames = require( '@stdlib/utils/writable-property-names' );
Returns an array
of an object's own writable property names.
var defineProperty = require( '@stdlib/utils/define-property' );
var obj = {
'a': 'b'
};
defineProperty( obj, 'c', {
'configurable': true,
'enumerable': true,
'writable': false,
'value': 'd'
});
var keys = writablePropertyNames( obj );
// returns [ 'a' ]
object
key enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort an object
's keys, thus allowing for deterministic extraction.var defineProperty = require( '@stdlib/utils/define-property' );
var writablePropertyNames = require( '@stdlib/utils/writable-property-names' );
function Foo() {
this.a = {
'b': 'c'
};
defineProperty( this, 'baz', {
'configurable': true,
'enumerable': true,
'writable': false,
'value': 'qux'
});
return this;
}
Foo.prototype.foo = [ 'bar' ];
defineProperty( Foo.prototype, 'bip', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'bop'
});
var obj = new Foo();
var keys = writablePropertyNames( obj );
console.log( keys );
// => [ 'a' ]