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Return an array of an object's own writable property names and symbols.
npm install @stdlib/utils-writable-propertiesAlternatively,
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denobranch (see README for usage intructions). - For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the
umdbranch (see README).
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var writableProperties = require( '@stdlib/utils-writable-properties' );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' ]- Property order is not guaranteed, as
objectproperty 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.
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', ... ]@stdlib/utils-inherited-writable-properties: return an array of an object's inherited writable property names and symbols.@stdlib/utils-writable-properties-in: return an array of an object's own and inherited writable property names and symbols.@stdlib/utils-properties: return an array of an object's own enumerable and non-enumerable property names and symbols.
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.
See LICENSE.
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