isBoxedPrimitive

Test if a value is a JavaScript boxed primitive.

Installation

npm install @stdlib/assert-is-boxed-primitive

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 isBoxedPrimitive = require( '@stdlib/assert-is-boxed-primitive' );

isBoxedPrimitive( value )

Tests if a value is a JavaScript boxed primitive.

var Boolean = require( '@stdlib/boolean-ctor' );

var bool = isBoxedPrimitive( new Boolean( false ) );
// returns true

bool = isBoxedPrimitive( true );
// returns false

Notes

Boxed primitive objects can be created with one of the following:
- new Boolean()
- new Number()
- new String()
- Object( Symbol() ) (ES6/ES2015)

Examples

var Boolean = require( '@stdlib/boolean-ctor' );
var Number = require( '@stdlib/number-ctor' );
var isBoxedPrimitive = require( '@stdlib/assert-is-boxed-primitive' );

var bool = isBoxedPrimitive( new Boolean( false ) );
// returns true

bool = isBoxedPrimitive( new String( 'beep' ) );
// returns true

bool = isBoxedPrimitive( new Number( 3.14 ) );
// returns true

bool = isBoxedPrimitive( false );
// returns false

bool = isBoxedPrimitive( 0 );
// returns false

bool = isBoxedPrimitive( '' );
// returns false

bool = isBoxedPrimitive( null );
// returns false

bool = isBoxedPrimitive( void 0 );
// returns false

bool = isBoxedPrimitive( [] );
// returns false

bool = isBoxedPrimitive( {} );
// returns false

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.