Reverse a string.
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> Reverse a string.
``bash`
npm install @stdlib/string-reverse
`javascript`
var reverseString = require( '@stdlib/string-reverse' );
#### reverseString( str\[, options] )
Reverses a string.
`javascript
var out = reverseString( 'last man standing' );
// returns 'gnidnats nam tsal'
out = reverseString( 'Hidden Treasures' );
// returns 'serusaerT neddiH'
out = reverseString( 'Lorem ipsum 𝌆 dolor sit ameͨ͆t.' );
// returns '.teͨ͆ma tis rolod 𝌆 muspi meroL'
`
The function supports the following options:
- mode: type of characters to reverse. Must be one of the following:
- 'grapheme': grapheme clusters. Appropriate for strings containing visual characters which can span multiple Unicode code points (e.g., emoji).'code_point'
- : Unicode code points. Appropriate for strings containing visual characters which are comprised of more than one Unicode code unit (e.g., ideographic symbols and punctuation and mathematical alphanumerics).'code_unit'
- : UTF-16 code units. Appropriate for strings containing visual characters drawn from the basic multilingual plane (BMP) (e.g., common characters, such as those from the Latin, Greek, and Cyrillic alphabets).
Default: 'grapheme'.
- By default, the function assumes the general case in which an input string may contain an arbitrary number of grapheme clusters. This assumption comes with a performance cost. Accordingly, if an input string is known to only contain visual characters of a particular type (e.g., only alphanumeric), one can achieve better performance by specifying the appropriate mode option.
`javascript
var reverseString = require( '@stdlib/string-reverse' );
var str = reverseString( 'last man standing' );
// returns 'gnidnats nam tsal'
str = reverseString( 'presidential election' );
// returns 'noitcele laitnediserp'
str = reverseString( 'javaScript' );
// returns 'tpircSavaj'
str = reverseString( 'Hidden Treasures' );
// returns 'serusaerT neddiH'
`
- [@stdlib/string-reverse-cli][@stdlib/string-reverse-cli]: CLI package for use as a command-line utility.
*
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].
[@stdlib/string-reverse-cli]: https://www.npmjs.com/package/@stdlib/string-reverse-cli
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[npm-url]: https://npmjs.org/package/@stdlib/string-reverse
[test-image]: https://github.com/stdlib-js/string-reverse/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/string-reverse/actions/workflows/test.yml?query=branch:v0.2.3
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/string-reverse/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/string-reverse?branch=main
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[chat-url]: https://stdlib.zulipchat.com
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[cli-section]: https://github.com/stdlib-js/string-reverse#cli
[cli-url]: https://github.com/stdlib-js/string-reverse/tree/cli
[@stdlib/string-reverse]: https://github.com/stdlib-js/string-reverse/tree/main
[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/string-reverse/tree/deno
[deno-readme]: https://github.com/stdlib-js/string-reverse/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/string-reverse/tree/umd
[umd-readme]: https://github.com/stdlib-js/string-reverse/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/string-reverse/tree/esm
[esm-readme]: https://github.com/stdlib-js/string-reverse/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/string-reverse/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/string-reverse/main/LICENSE
[mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams