inheritedPropertyNames

Return an array of an object's inherited enumerable and non-enumerable property names.

Installation

npm install @stdlib/utils-inherited-property-names

Usage

var inheritedPropertyNames = require( '@stdlib/utils-inherited-property-names' );

inheritedPropertyNames( obj[, level] )

Returns an array of an object's inherited enumerable and non-enumerable property names.

function Foo() {
    this.a = 'b';
    return this;
}

Foo.prototype.beep = 'boop';

var f = new Foo();
var keys = inheritedPropertyNames( 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 inherit = require( '@stdlib/utils-inherit' );

function Bar() {
    return this;
}

Bar.prototype.boop = 'beep';

function Foo() {
    Bar.call( this );
    this.a = 'b';
    return this;
}

inherit( Foo, Bar );
Foo.prototype.beep = 'boop';

var f = new Foo();
var keys = inheritedPropertyNames( 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 an object's keys, thus allowing for deterministic extraction.

Examples

var defineProperty = require( '@stdlib/utils-define-property' );
var inheritedPropertyNames = require( '@stdlib/utils-inherited-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 = inheritedPropertyNames( obj );

console.log( keys );
// e.g., => [ 'foo', 'bip', ... ]

See Also

• @stdlib/utils-inherited-keys: return an array of an object's inherited enumerable property names.
• @stdlib/utils-inherited-property-descriptors: return an object's inherited property descriptors.
• @stdlib/utils-inherited-property-symbols: return an array of an object's inherited symbol properties.
• @stdlib/utils-property-names: return an array of an object's own enumerable and non-enumerable property names.
• @stdlib/utils-property-names-in: return an array of an object's own and inherited enumerable and non-enumerable property names.

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 © 2016-2024. The Stdlib Authors.