README.md

About stdlib...

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.

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isNaN

Test if a value is NaN.

Usage

import isnan from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-nan@deno/mod.js';

You can also import the following named exports from the package:

import { isObject, isPrimitive } from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-nan@deno/mod.js';

isnan( value )

Tests if a value is NaN.

import Number from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-ctor@deno/mod.js';

var bool = isnan( NaN );
// returns true

bool = isnan( new Number( NaN ) );
// returns true

bool = isnan( 3.14 );
// returns false

bool = isnan( null );
// returns false

isnan.isPrimitive( value )

Tests if a value is a NaN primitive number.

import Number from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-ctor@deno/mod.js';

var bool = isnan.isPrimitive( NaN );
// returns true

bool = isnan.isPrimitive( 3.14 );
// returns false

bool = isnan.isPrimitive( new Number( NaN ) );
// returns false

isnan.isObject( value )

Tests if a value is a Number object having a value of NaN.

import Number from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-ctor@deno/mod.js';

var bool = isnan.isObject( NaN );
// returns false

bool = isnan.isObject( new Number( NaN ) );
// returns true

Examples

import Number from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-ctor@deno/mod.js';
import Symbol from 'https://cdn.jsdelivr.net/gh/stdlib-js/symbol-ctor@deno/mod.js';
import isnan from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-nan@deno/mod.js';

var bool = isnan( NaN );
// returns true

bool = isnan( new Number( NaN ) );
// returns true

bool = isnan( 5 );
// returns false

bool = isnan( '5' );
// returns false

bool = isnan( null );
// returns false

bool = isnan( Symbol( 'NaN' ) );
// returns false

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See Also

• @stdlib/assert-is-number: test if a value is a number.

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Notice

This package is part of stdlib, a standard library 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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.