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@stdlib/assert-instance-of
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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!
Test whether a value has in its prototype chain a specified constructor as a prototype property.
npm install @stdlib/assert-instance-of
var instanceOf = require( '@stdlib/assert-instance-of' );
Tests whether a value
has in its prototype chain a specified constructor
as a prototype
property.
var inherit = require( '@stdlib/utils-inherit' );
function Foo() {
return this;
}
function Bar() {
return this;
}
inherit( Bar, Foo );
var bar = new Bar();
var bool = instanceOf( bar, Foo );
// returns true
The function throws a TypeError
if provided a constructor
argument which is not callable.
var bool = instanceOf( {}, null );
// throws <TypeError>
While the prototype of an object
created using object literal notion is undefined
, the function returns true
when provided an object
literal and the Object
constructor. This maintains consistent behavior with the instanceof
operator.
var Object = require( '@stdlib/object-ctor' );
var bool = ( {} instanceof Object );
// returns true
bool = instanceOf( {}, Object );
// returns true
var Number = require( '@stdlib/number-ctor' );
var Object = require( '@stdlib/object-ctor' );
var Function = require( '@stdlib/function-ctor' );
var instanceOf = require( '@stdlib/assert-instance-of' );
var bool = instanceOf( [], Array );
// returns true
bool = instanceOf( [], Object );
// returns true
bool = instanceOf( {}, Object );
// returns true
bool = instanceOf( new Date(), Date );
// returns true
bool = instanceOf( /.*/, RegExp );
// returns true
bool = instanceOf( instanceOf, Function );
// returns true
bool = instanceOf( null, Object );
// returns false
bool = instanceOf( 5, Number );
// returns false
bool = instanceOf( '5', String );
// returns false
bool = instanceOf( void 0, Object );
// returns false
bool = instanceOf( {}, Array );
// returns false
bool = instanceOf( {}, Function );
// returns false
@stdlib/assert-is-prototype-of
: test if an object's prototype chain contains a provided prototype.@stdlib/utils-constructor-name
: determine the name of a value's constructor.@stdlib/utils-inherit
: implement prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.@stdlib/utils-type-of
: determine a value's type.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.
FAQs
Test whether a value has in its prototype chain a specified constructor as a prototype property.
We found that @stdlib/assert-instance-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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