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About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

inheritedPropertyDescriptor

NPM version Build Status Coverage Status

Return a property descriptor for an object's inherited property.

Usage

import inheritedPropertyDescriptor from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-inherited-property-descriptor@esm/index.mjs';

inheritedPropertyDescriptor( obj, property[, level] )

Returns a property descriptor for an object's inherited property.

function Foo() {
    return this;
}

Foo.prototype.bar = 'foo';

var obj = new Foo();

var desc = inheritedPropertyDescriptor( obj, 'bar' );
// returns {'configurable':true,'enumerable':true,'writable':true,'value':'foo'}

By default, the function walks an object's entire prototype chain. To limit the inheritance level, provide a level argument.

import inherit from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-inherit@esm/index.mjs';

function Bar() {
    return this;
}

Bar.prototype.beep = 'boop';

function Foo() {
    Bar.call( this );
    return this;
}

inherit( Foo, Bar );

var f = new Foo();
var desc = inheritedPropertyDescriptor( f, 'beep', 1 );
// returns null

Notes

  • This function differs from the built-in Object.getOwnPropertyDescriptor() as follows:

    • If provided null or undefined, the function returns null, rather than throwing an error.
    • If an object does not have a provided inherited property, the function returns null, rather than undefined.

Examples

<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">

import defineProperty from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-define-property@esm/index.mjs';
import inheritedPropertyDescriptor from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-inherited-property-descriptor@esm/index.mjs';

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 desc = inheritedPropertyDescriptor( obj, 'foo' );

console.log( desc );
// => {'configurable':true,'enumerable':true,'writable':true,'value':['bar']}

</script>
</body>
</html>

See Also

Notice

This package is part of stdlib, a standard library 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

Chat

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.