npm package: @stdlib/string-next-code-point-index
Description: Return the position of the next Unicode code point in a string after a specified position.
Author: The Stdlib Authors
Latest version: 0.2.3

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# nextCodePointIndex

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

> Return the position of the next Unicode code point in a string after a specified position.

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</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/string-next-code-point-index
```

</section>

<section class="usage">

## Usage

```javascript
var nextCodePointIndex = require( '@stdlib/string-next-code-point-index' );
```

#### nextCodePointIndex( string\[, fromIndex] )

Returns the position of the next Unicode code point in a string after a specified position.

```javascript
var out = nextCodePointIndex( 'last man standing' );
// returns 1
```

By default, the function searches for a Unicode code point starting from the first index. To specify an alternative starting search index, provide a `fromIndex` argument.

```javascript
var out = nextCodePointIndex( 'last man standing', 4 );
// returns 5
```

</section>

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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   If `string` is an empty string, the function returns `-1` irrespective of `fromIndex`.
-   If a code point does not exist after `fromIndex`, the function returns `-1`.
-   Note that `fromIndex` does **not** refer to a visual character position, but to an index in the ordered sequence of [UTF-16][utf-16] code units.

</section>

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<!-- Package usage examples. -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var nextCodePointIndex = require( '@stdlib/string-next-code-point-index' );

var out = nextCodePointIndex( 'last man standing', 4 );
// returns 5

out = nextCodePointIndex( 'presidential election', 8 );
// returns 9

out = nextCodePointIndex( '𐒻𐓟𐒻𐓟', 0 );
// returns 2

out = nextCodePointIndex( '🌷', 0 );
// returns -1
```

</section>

<!-- /.examples -->

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## See Also

-   <span class="package-name">[`@stdlib/string-next-code-point-index-cli`][@stdlib/string-next-code-point-index-cli]</span><span class="delimiter">: </span><span class="description">CLI package for use as a command-line utility.</span>


</section>

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* * *

## 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 &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[@stdlib/string-next-code-point-index-cli]: https://www.npmjs.com/package/@stdlib/string-next-code-point-index-cli

[npm-image]: http://img.shields.io/npm/v/@stdlib/string-next-code-point-index.svg
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[cli-section]: https://github.com/stdlib-js/string-next-code-point-index#cli
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[@stdlib/string-next-code-point-index]: https://github.com/stdlib-js/string-next-code-point-index/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-next-code-point-index/tree/deno
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[umd-readme]: https://github.com/stdlib-js/string-next-code-point-index/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/string-next-code-point-index/tree/esm
[esm-readme]: https://github.com/stdlib-js/string-next-code-point-index/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/string-next-code-point-index/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/string-next-code-point-index/main/LICENSE

[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams

[utf-16]: https://en.wikipedia.org/wiki/UTF-16

</section>

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