Return an array of an object's own and inherited enumerable and non-enumerable property names.
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Return an array of an object’s own and inherited enumerable and non-enumerable property names.
bash
npm install @stdlib/utils-property-names-inscript tag without installation and bundlers, use the [ES Module][es-module] available on the [esm][esm-url] branch (see [README][esm-readme]).deno][deno-url] branch (see [README][deno-readme] for usage intructions).umd][umd-url] branch (see [README][umd-readme]).javascript
var propertyNamesIn = require( '@stdlib/utils-property-names-in' );array of an object’s own and inherited enumerable and non-enumerable property names.javascript
var obj = {
'a': 1,
'b': 2
};
var keys = propertyNamesIn( obj );
// e.g., returns [ 'a', 'b', ... ]object key enumeration is not specified according to the [ECMAScript specification][ecma-262-for-in]. In practice, however, most engines use insertion order to sort an object‘s keys, thus allowing for deterministic extraction.Object.getOwnPropertyNames(), if provided null or undefined, the function returns an empty array, rather than throwing an error.javascript
var defineProperty = require( '@stdlib/utils-define-property' );
var propertyNamesIn = require( '@stdlib/utils-property-names-in' );
function Foo() {
this.beep = 'boop';
this.a = {
'b': 'c'
};
defineProperty( this, 'baz', {
'value': 'qux',
'configurable': true,
'writable': true,
'enumerable': false
});
return this;
}
Foo.prototype.foo = [ 'bar' ];
var obj = new Foo();
var keys = propertyNamesIn( obj );
console.log( keys );
// e.g., => [ 'beep', 'a', 'baz', 'foo', ... ]
