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Prototypical Inheritance

Implement prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.

Installation

npm install @stdlib/utils-inherit

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the 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.

Usage

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.

function Foo() {
    return this;
}

Foo.prototype.beep = function beep() {
    return 'boop';
};

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

inherit( Bar, Foo );

Notes

• This function is not designed to work with ES2015/ES6 classes. For ES2015/ES6 classes, use class with extends.

Examples

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'

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Notice

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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.