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.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

# isInteger [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] > Test if a finite [double-precision floating-point number][ieee754] is an integer.
## Installation ```bash npm install @stdlib/math-base-assert-is-integer ```
## Usage ```javascript var isInteger = require( '@stdlib/math-base-assert-is-integer' ); ``` #### isInteger( x ) Tests if a finite [double-precision floating-point number][ieee754] is an integer. ```javascript var bool = isInteger( 1.0 ); // returns true ```
## Notes - The function assumes a **finite** number. If provided positive or negative `infinity`, the function will return `true`, when, in fact, the result is undefined. If `x` can be `infinite`, wrap the implementation as follows: ```javascript function check( x ) { return ( x < Infinity && x > -Infinity && isInteger( x ) ); } var bool = check( Infinity ); // returns false bool = check( -Infinity ); // returns false ```
## Examples ```javascript var isInteger = require( '@stdlib/math-base-assert-is-integer' ); var bool = isInteger( -5.0 ); // returns true bool = isInteger( 3.14 ); // returns false bool = isInteger( NaN ); // returns false ```
* * *
## C APIs
### Usage ```c #include "stdlib/math/base/assert/is_integer.h" ``` #### stdlib_base_is_integer( x ) Tests if a finite [double-precision floating-point number][ieee754] is an integer. ```c bool out = stdlib_base_is_integer( 1.0 ); // returns true out = stdlib_base_is_integer( 3.14 ); // returns false ``` The function accepts the following arguments: - **x**: `[in] double` input value. ```c bool stdlib_base_is_integer( const double x ); ```
### Examples ```c #include "stdlib/math/base/assert/is_integer.h" #include #include #include int main( void ) { double x; bool v; int i; for ( i = 0; i < 100; i++ ) { x = ( ( (double)rand() / (double)RAND_MAX ) * 100.0 ) - 50.0; v = stdlib_base_is_integer( x ); printf( "x = %lf, is_integer(x) = %s\n", x, ( v ) ? "true" : "false" ); } } ```
* * * ## 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 © 2016-2024. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/math-base-assert-is-integer.svg [npm-url]: https://npmjs.org/package/@stdlib/math-base-assert-is-integer [test-image]: https://github.com/stdlib-js/math-base-assert-is-integer/actions/workflows/test.yml/badge.svg?branch=v0.2.5 [test-url]: https://github.com/stdlib-js/math-base-assert-is-integer/actions/workflows/test.yml?query=branch:v0.2.5 [coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-base-assert-is-integer/main.svg [coverage-url]: https://codecov.io/github/stdlib-js/math-base-assert-is-integer?branch=main [chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg [chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im [stdlib]: https://github.com/stdlib-js/stdlib [stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors [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-integer/tree/deno [deno-readme]: https://github.com/stdlib-js/math-base-assert-is-integer/blob/deno/README.md [umd-url]: https://github.com/stdlib-js/math-base-assert-is-integer/tree/umd [umd-readme]: https://github.com/stdlib-js/math-base-assert-is-integer/blob/umd/README.md [esm-url]: https://github.com/stdlib-js/math-base-assert-is-integer/tree/esm [esm-readme]: https://github.com/stdlib-js/math-base-assert-is-integer/blob/esm/README.md [branches-url]: https://github.com/stdlib-js/math-base-assert-is-integer/blob/main/branches.md [stdlib-license]: https://raw.githubusercontent.com/stdlib-js/math-base-assert-is-integer/main/LICENSE [ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985