Implement prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.
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> Implement prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.
``bash`
npm install @stdlib/utils-inherit
`javascript`
var inherit = require( '@stdlib/utils-inherit' );
#### inherit( ctor, superCtor )
Implements prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.
`javascript
function Foo() {
return this;
}
Foo.prototype.beep = function beep() {
return 'boop';
};
function Bar() {
Foo.call( this );
return this;
}
inherit( Bar, Foo );
`
- This function is not designed to work with ES2015/ES6 classes. For ES2015/ES6 classes, use class with extends.
`javascript
var inherit = require( '@stdlib/utils-inherit' );
function Foo() {
return this;
}
Foo.prototype = {};
Foo.prototype.beep = function beep() {
return 'boop';
};
function Bar() {
Foo.call( this );
this._super = Foo.prototype;
return this;
}
// Set up prototypical inheritance:
inherit( Bar, Foo );
var bar = new Bar();
var bool = ( bar instanceof Bar );
// returns true
bool = ( bar instanceof Foo );
// returns true
bool = bar.beep();
// returns 'boop'
`
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/utils-inherit/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-inherit/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-inherit/tree/umd
[umd-readme]: https://github.com/stdlib-js/utils-inherit/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/utils-inherit/tree/esm
[esm-readme]: https://github.com/stdlib-js/utils-inherit/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/utils-inherit/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-inherit/main/LICENSE