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isDigitString

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

Test whether a string contains only numeric digits.

## Installation

bash
npm install @stdlib/assert-is-digit-string

Alternatively,

- To load the package in a website via a script tag without installation and bundlers, use the [ES Module][es-module] available on the [esm][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [deno][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [umd][umd-url] branch (see [README][umd-readme]).
- To use as a general utility for the command line, install the corresponding [CLI package][cli-section] globally.

The [branches.md][branches-url] 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

javascript
var isDigitString = require( '@stdlib/assert-is-digit-string' );

#### isDigitString( value )

Tests whether a string contains only numeric digits.

javascript
var bool = isDigitString( '0123456789' );
// returns true

## Notes

- For non-string values, the function returns false.

## Examples

javascript
var isDigitString = require( '@stdlib/assert-is-digit-string' );

var out = isDigitString( '0123456789' );
// returns true

out = isDigitString( '' );
// returns false

out = isDigitString( '0xffffff' );
// returns false

out = isDigitString( 123 );
// returns false

## CLI

## Installation

To use as a general utility, install the CLI package globally

bash
npm install -g @stdlib/assert-is-digit-string-cli

### Usage

text
Usage: is-digit-string [options] [<string>]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.

### Notes

- If the split separator is a [regular expression][mdn-regexp], ensure that the split option is either properly escaped or enclosed in quotes.

bash
    # Not escaped...
    $ echo -n $'beEp booP\n0123456' | is-digit-string --split /\r?\n/
    # Escaped...
    $ echo -n $'beEp booP\n0123456' | is-digit-string --split /\\r?\\n/

- The implementation ignores trailing delimiters.

### Examples

bash
$ is-digit-string 0123456789
true

To use as a [standard stream][standard-streams],

bash
$ echo -n '0123456789' | is-digit-string
true

By default, when used as a [standard stream][standard-streams], the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.

bash
$ echo -n 'beep\t123' | is-digit-string --split '\t'
false
true

*

## 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 © 2016-2025. The Stdlib [Authors][stdlib-authors].