README
inheritedNonEnumerablePropertyNames
Return an array of an object's inherited non-enumerable property names.
Installation
npm install @stdlib/utils-inherited-nonenumerable-property-names
Usage
var inheritedNonEnumerablePropertyNames = require( '@stdlib/utils-inherited-nonenumerable-property-names' );
inheritedNonEnumerablePropertyNames( obj[, level] )
Returns an array
of an object's inherited non-enumerable property names.
var defineProperty = require( '@stdlib/utils-define-property' );
function Foo() {
this.a = 'b';
return this;
}
defineProperty( Foo.prototype, 'beep', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'boop'
});
var f = new Foo();
var keys = inheritedNonEnumerablePropertyNames( f );
// e.g., returns [ 'beep', ... ]
By default, the function walks an object's entire prototype chain. To limit the inheritance level, provide a level
argument.
var defineProperty = require( '@stdlib/utils-define-property' );
var inherit = require( '@stdlib/utils-inherit' );
function Bar() {
return this;
}
defineProperty( Bar.prototype, 'boop', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'beep'
});
function Foo() {
Bar.call( this );
this.a = 'b';
return this;
}
inherit( Foo, Bar );
defineProperty( Foo.prototype, 'beep', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'boop'
});
var f = new Foo();
var keys = inheritedNonEnumerablePropertyNames( f, 1 );
// e.g., returns [ 'beep', ... ]
Notes
- Name order is not guaranteed, as
object
key enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort anobject
's keys, thus allowing for deterministic extraction.
Examples
var defineProperty = require( '@stdlib/utils-define-property' );
var inheritedNonEnumerablePropertyNames = require( '@stdlib/utils-inherited-nonenumerable-property-names' );
function Foo() {
this.beep = 'boop';
this.a = {
'b': 'c'
};
defineProperty( this, 'baz', {
'configurable': false,
'enumerable': false,
'writable': true,
'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 = inheritedNonEnumerablePropertyNames( obj );
console.log( keys );
// e.g., => [ 'bip', ... ]
Notice
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2022. The Stdlib Authors.