@stdlib/assert-is-lowercase

Test if a value is a lowercase string.

Usage no npm install needed!

<script type="module">
  import stdlibAssertIsLowercase from 'https://cdn.skypack.dev/@stdlib/assert-is-lowercase';
</script>

README

isLowercase

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Test if a value is a lowercase string.

Installation

npm install @stdlib/assert-is-lowercase

Usage

var isLowercase = require( '@stdlib/assert-is-lowercase' );

isLowercase( value )

Tests if a value is a lowercase string.

var bool = isLowercase( 'salt and light' );
// returns true

bool = isLowercase( 'HELLO' );
// returns false

bool = isLowercase( 'World' );
// returns false

Notes

  • This function validates that a value is a string. For all other types, the function returns false.

Examples

var isLowercase = require( '@stdlib/assert-is-lowercase' );

var bool = isLowercase( 'hello' );
// returns true

bool = isLowercase( '' );
// returns false

bool = isLowercase( 'Hello' );
// returns false

bool = isLowercase( 'HELLO' );
// returns false

CLI

Installation

To use the module as a general utility, install the module globally

npm install -g @stdlib/assert-is-lowercase

Usage

Usage: is-lowercase [options] [<string>]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.

Examples

$ is-lowercase BEEP
false

To use as a standard stream,

$ echo -n 'boop' | is-lowercase
true

Notice

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

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License

See LICENSE.

Copyright

Copyright © 2016-2022. The Stdlib Authors.