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@stdlib/assert-instance-of
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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 bool = ( {} instanceof Object );
// returns true
bool = instanceOf( {}, Object );
// returns true
var Number = require( '@stdlib/number-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
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 © 2016-2021. The Stdlib Authors.
FAQs
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The npm package @stdlib/assert-instance-of receives a total of 9,657 weekly downloads. As such, @stdlib/assert-instance-of popularity was classified as popular.
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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