0.2.2 • Published 5 months ago
@stdlib/utils-inherited-enumerable-property-symbols v0.2.2
inheritedEnumerablePropertySymbols
Return an array of an object's inherited enumerable symbol properties.
Installation
npm install @stdlib/utils-inherited-enumerable-property-symbols
Usage
var inheritedEnumerablePropertySymbols = require( '@stdlib/utils-inherited-enumerable-property-symbols' );
inheritedEnumerablePropertySymbols( obj[, level] )
Returns an array
of an object's inherited enumerable symbol properties.
var hasSymbolSupport = require( '@stdlib/assert-has-symbol-support' );
var Symbol = require( '@stdlib/symbol-ctor' );
var hasSymbols = hasSymbolSupport();
var symbols;
var f;
function Foo() {
if ( hasSymbols ) {
this[ Symbol( 'a' ) ] = 'a';
}
return this;
}
if ( hasSymbols ) {
Foo.prototype[ Symbol( 'b' ) ] = 'b';
}
f = new Foo();
symbols = inheritedEnumerablePropertySymbols( f );
By default, the function walks an object's entire prototype chain. To limit the inheritance level, provide a level
argument.
var symbols = inheritedEnumerablePropertySymbols( [], 1 );
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 inheritedEnumerablePropertySymbols = require( '@stdlib/utils-inherited-enumerable-property-symbols' );
var hasSymbols = hasSymbolSupport();
var symbols;
var obj;
function Foo() {
this.a = 'a';
defineProperty( this, 'b', {
'configurable': false,
'enumerable': false,
'writable': true,
'value': 'b'
});
if ( hasSymbols ) {
this[ Symbol( 'a' ) ] = 'a';
defineProperty( this, Symbol( 'b' ), {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'b'
});
}
return this;
}
Foo.prototype.c = 'c';
defineProperty( Foo.prototype, 'd', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'd'
});
if ( hasSymbols ) {
Foo.prototype[ Symbol( 'c' ) ] = 'c';
defineProperty( Foo.prototype, Symbol( 'd' ), {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'd'
});
}
obj = new Foo();
symbols = inheritedEnumerablePropertySymbols( obj );
console.log( symbols );
See Also
@stdlib/utils-enumerable-properties
: return an array of an object's own enumerable property names and symbols.@stdlib/utils-enumerable-property-symbols
: return an array of an object's own enumerable symbol properties.@stdlib/utils-inherited-keys
: return an array of an object's inherited enumerable property names.@stdlib/utils-nonenumerable-property-symbols
: return an array of an object's own non-enumerable symbol properties.@stdlib/utils-nonenumerable-property-symbols-in
: return an array of an object's own and inherited non-enumerable symbol properties.@stdlib/utils-property-symbols
: return an array of an object's own symbol properties.
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.