Test if an object's own or inherited property has a data descriptor.
APACHE-2.0 License
Test if an object's own or inherited property has a data descriptor.
npm install @stdlib/assert-is-data-property-in
Alternatively,
script
tag without installation and bundlers, use the ES Module available on the esm
branch (see README).deno
branch (see README for usage intructions).umd
branch (see README).The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
var isDataPropertyIn = require( '@stdlib/assert-is-data-property-in' );
Returns a boolean
indicating if a value
has a data property
(either own or inherited).
var defineProperty = require( '@stdlib/utils-define-property' );
var bool;
var obj;
function Foo() {
this.foo = 'bar';
return this;
}
defineProperty( Foo.prototype, 'beep', {
'configurable': false,
'enumerable': false,
'writable': false,
'value': 'boop'
});
defineProperty( Foo.prototype, 'accessor', {
'configurable': false,
'enumerable': false,
'get': function getter() {
return obj.foo;
},
'set': function setter( v ) {
obj.foo = v;
}
});
obj = new Foo();
bool = isDataPropertyIn( obj, 'foo' );
// returns true
bool = isDataPropertyIn( obj, 'beep' );
// returns true
bool = isDataPropertyIn( obj, 'accessor' );
// returns false
Value arguments other than null
or undefined
are coerced to objects
.
var bool = isDataPropertyIn( 'beep', 'length' );
// returns true
Non-symbol property arguments are coerced to strings
.
var obj = {
'null': 'foo'
};
var bool = isDataPropertyIn( obj, null );
// returns true
var isDataPropertyIn = require( '@stdlib/assert-is-data-property-in' );
var bool = isDataPropertyIn( [ 'a' ], 'length' );
// returns true
bool = isDataPropertyIn( { 'a': 'b' }, 'a' );
// returns true
bool = isDataPropertyIn( [ 'a' ], 0 );
// returns true
bool = isDataPropertyIn( { 'null': false }, null );
// returns true
bool = isDataPropertyIn( { '[object Object]': false }, {} );
// returns true
bool = isDataPropertyIn( {}, 'toString' );
// returns true
bool = isDataPropertyIn( {}, 'hasOwnProperty' );
// returns true
bool = isDataPropertyIn( null, 'a' );
// returns false
bool = isDataPropertyIn( void 0, 'a' );
// returns false
@stdlib/assert-has-property
: test if an object has a specified property, either own or inherited.
@stdlib/assert-is-accessor-property-in
: test if an object's own or inherited property has an accessor descriptor.
@stdlib/assert-is-data-property
: test if an object's own property has a data descriptor.
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.
Copyright © 2016-2024. The Stdlib Authors.