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Test if a value is a JavaScript boxed primitive.
To use in Observable,
isBoxedPrimitive = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-boxed-primitive@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var isBoxedPrimitive = require( 'path/to/vendor/umd/assert-is-boxed-primitive/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-boxed-primitive@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.isBoxedPrimitive;
})();
</script>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-
Boxed primitive objects can be created with one of the following:
new Boolean()new Number()new String()Object( Symbol() )(ES6/ES2015)
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/boolean-ctor@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/number-ctor@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-boxed-primitive@umd/browser.js"></script>
<script type="text/javascript">
(function () {
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
})();
</script>
</body>
</html>@stdlib/assert-is-primitive: test if a value is a JavaScript primitive.
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.
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