Test if a value is a constant-case string.
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> Test if a value is a constantcase string.
To use as a general utility, install the CLI package globally
``bash`
npm install -g @stdlib/assert-is-constantcase-cli
`text
Usage: is-constantcase [options] [
Options:
-h, --help Print this message.
-V, --version Print the package version.
--split sep Delimiter for stdin data. Default: '/\\r?\\n/'.
`
- 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\nFOO' | is-constantcase --split /\r?\n/
# Escaped...
$ echo -n $'beEp booP\nFOO' | is-constantcase --split /\\r?\\n/
- The implementation ignores trailing delimiters.
`bash`
$ is-constantcase BEEP_BOOP
true
To use as a [standard stream][standard-streams],
`bash`
$ echo -n 'beep Boop' | is-constantcase
false
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 'beepBoop\tBEEP_BOOP' | is-constantcase --split '\t'
false
true
- [@stdlib/assert-is-constantcase][@stdlib/assert-is-constantcase]: test if a value is a constant-case string.
- [@stdlib/assert-is-string][@stdlib/assert/is-string]: test if a value is a string.
- [@stdlib/assert-is-camelcase][@stdlib/assert/is-camelcase]: test if a value is a camelcase string.
*
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].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[stdlib]: https://github.com/stdlib-js/stdlib
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[cli-section]: https://github.com/stdlib-js/assert-is-constantcase#cli
[cli-url]: https://github.com/stdlib-js/assert-is-constantcase/tree/cli
[@stdlib/assert-is-constantcase]: https://www.npmjs.com/package/@stdlib/assert-is-constantcase
[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/assert-is-constantcase/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-constantcase/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-constantcase/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-constantcase/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-constantcase/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-constantcase/blob/esm/README.md
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-constantcase/main/LICENSE
[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams
[mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
[@stdlib/assert/is-string]: https://www.npmjs.com/package/@stdlib/assert-is-string
[@stdlib/assert/is-camelcase]: https://www.npmjs.com/package/@stdlib/assert-is-camelcase