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@stdlib/utils-get-prototype-of
Advanced tools
@stdlib/utils-get-prototype-of is a utility package that provides a function to get the prototype of an object. This can be useful in various scenarios such as inheritance checks, debugging, and understanding object structures.
Get Prototype of an Object
This feature allows you to retrieve the prototype of a given object. In this example, the prototype of an empty object is retrieved and logged to the console.
const getPrototypeOf = require('@stdlib/utils-get-prototype-of');
const obj = {};
const proto = getPrototypeOf(obj);
console.log(proto);
Check Inheritance
This feature can be used to check if an object inherits from a specific prototype. In this example, we create a parent and child constructor, set up inheritance, and then check if an instance of the child inherits from the parent's prototype.
const getPrototypeOf = require('@stdlib/utils-get-prototype-of');
function Parent() {}
function Child() {}
Child.prototype = Object.create(Parent.prototype);
const childInstance = new Child();
const isInherited = getPrototypeOf(childInstance) === Parent.prototype;
console.log(isInherited);
Lodash is a popular utility library that includes a wide range of functions, including '_.prototypeOf' which can be used to get the prototype of an object. While Lodash offers more comprehensive utilities, it is larger in size compared to @stdlib/utils-get-prototype-of.
Core-js is a modular standard library for JavaScript that includes polyfills for ECMAScript features. It provides a 'core-js/library/fn/object/get-prototype-of' function that can be used to get the prototype of an object. It is more feature-rich and includes polyfills for other ECMAScript features.
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!
Return the prototype of a provided object.
npm install @stdlib/utils-get-prototype-of
var getPrototypeOf = require( '@stdlib/utils-get-prototype-of' );
Returns the prototype
of an input value
.
var proto = getPrototypeOf( {} );
// returns {}
In contrast to the native Object.getPrototypeOf
, this function does not throw when provided null
or undefined
. Instead, similar to when provided any value with no inherited properties, the function returns null
.
var proto = getPrototypeOf( Object.create( null ) );
// returns null
proto = getPrototypeOf( null );
// returns null
proto = getPrototypeOf( void 0 );
// returns null
Value arguments other than null
or undefined
are coerced to objects
.
var proto = getPrototypeOf( 'beep' );
// returns String.prototype
proto = getPrototypeOf( 5 );
// returns Number.prototype
This behavior matches ES6/ES2015 native Object.getPrototypeOf
behavior. In ES5, the native Object.getPrototypeOf
throws when provided non-object values.
var getPrototypeOf = require( '@stdlib/utils-get-prototype-of' );
var proto = getPrototypeOf( 'beep' );
// returns String.prototype
proto = getPrototypeOf( 5 );
// returns Number.prototype
proto = getPrototypeOf( true );
// returns Boolean.prototype
proto = getPrototypeOf( null );
// returns null
proto = getPrototypeOf( void 0 );
// returns null
proto = getPrototypeOf( [] );
// returns Array.prototype
proto = getPrototypeOf( {} );
// returns {}
proto = getPrototypeOf( function foo() {} );
// returns Function.prototype
@stdlib/assert-is-prototype-of
: test if an object's prototype chain contains a provided prototype.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.
0.2.2 (2024-07-27)
No changes reported for this release.
</section> <!-- /.release --> <section class="release" id="v0.2.1">FAQs
Return the prototype of a provided object.
The npm package @stdlib/utils-get-prototype-of receives a total of 384,737 weekly downloads. As such, @stdlib/utils-get-prototype-of popularity was classified as popular.
We found that @stdlib/utils-get-prototype-of demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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