项目作者: stdlib-js

项目描述 :
Test whether a string contains only numeric digits.
高级语言: JavaScript
项目地址: git://github.com/stdlib-js/assert-is-digit-string.git
创建时间: 2021-06-14T16:54:17Z
项目社区:https://github.com/stdlib-js/assert-is-digit-string

开源协议:Apache License 2.0

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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]

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## License

See [LICENSE][stdlib-license].


## Copyright

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