npm package: @stdlib/math-base-assert-is-finite
Description: Test if a double-precision floating-point numeric value is finite.
Author: The Stdlib Authors
Latest version: 0.2.3

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# isfinite

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Test if a double-precision floating-point numeric value is finite.

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-assert-is-finite
```

</section>

<section class="usage">

## Usage

```javascript
var isfinite = require( '@stdlib/math-base-assert-is-finite' );
```

#### isfinite( x )

Tests if a double-precision floating-point `numeric` value is finite.

```javascript
var bool = isfinite( 3.14 );
// returns true

bool = isfinite( Infinity );
// returns false

bool = isfinite( -Infinity );
// returns false

bool = isfinite( NaN );
// returns false
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var PINF = require( '@stdlib/constants-float64-pinf' );
var NINF = require( '@stdlib/constants-float64-ninf' );
var isfinite = require( '@stdlib/math-base-assert-is-finite' );

var bool = isfinite( 5.0 );
// returns true

bool = isfinite( -2.0e64 );
// returns true

bool = isfinite( PINF );
// returns false

bool = isfinite( NINF );
// returns false

bool = isfinite( NaN );
// returns false
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/math-base/assert/is-infinite`][@stdlib/math/base/assert/is-infinite]</span><span class="delimiter">: </span><span class="description">test if a double-precision floating-point numeric value is infinite.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/math-base-assert-is-finite/tree/deno
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<!-- <related-links> -->

[@stdlib/math/base/assert/is-infinite]: https://www.npmjs.com/package/@stdlib/math-base-assert-is-infinite

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</section>

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