Test if a string ends with the characters of another string.
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> Test if a string ends with the characters of another string.
``bash`
npm install @stdlib/string-ends-with
`javascript`
var endsWith = require( '@stdlib/string-ends-with' );
#### endsWith( str, search\[, len] )
Tests if a string ends with the characters of another string.
`javascript
var str = 'Remember the story I used to tell you when you were a boy?';
var bool = endsWith( str, 'boy?' );
// returns true
bool = endsWith( str, 'Boy?' );
// returns false
`
To search for a match at the end of a substring, provide a len argument. If len is positive, the function restricts the search to a substring with length len, beginning with the leftmost character. If len is negative, len indicates to ignore the last len characters (equivalent of str.length + len).
`javascript
var str = 'To be, or not to be, that is the question.';
var bool = endsWith( str, 'to be', 19 );
// returns true
bool = endsWith( str, 'to be', -23 );
// returns true
`
If provided an empty search string, the function always returns true.
`javascript
var str = 'beep boop';
var bool = endsWith( str, '' );
// returns true
`
- In general, exercise caution when operating on substrings containing Unicode characters, as the visual character length may not equal the number of code points. For example,
`javascript`
var len = '🏠'.length;
// returns 2
- This function differs from [String.prototype.endsWith][mdn-string-endswith] in the following ways:
- The function requires string values for the first and second arguments and requires that the len argument is an integer value.len
- The function does not clamp positive values to the end of the input string.search
- Except when provided an empty string, the function always returns false if len resolves to a starting search position which exceeds the bounds of the input string.
`javascript
var endsWith = require( '@stdlib/string-ends-with' );
var str = 'Fair is foul, and foul is fair, hover through fog and filthy air';
var bool = endsWith( str, 'air' );
// returns true
bool = endsWith( str, 'fair' );
// returns false
bool = endsWith( str, 'fair', 30 );
// returns true
bool = endsWith( str, 'fair', -34 );
// returns true
`
- [@stdlib/string-ends-with-cli][@stdlib/string-ends-with-cli]: CLI package for use as a command-line utility.
- [@stdlib/string-starts-with][@stdlib/string/starts-with]: test if a string starts with the characters of another 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].
[@stdlib/string-ends-with-cli]: https://www.npmjs.com/package/@stdlib/string-ends-with-cli
[npm-image]: http://img.shields.io/npm/v/@stdlib/string-ends-with.svg
[npm-url]: https://npmjs.org/package/@stdlib/string-ends-with
[test-image]: https://github.com/stdlib-js/string-ends-with/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/string-ends-with/actions/workflows/test.yml?query=branch:v0.2.3
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/string-ends-with/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/string-ends-with?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-ends-with#cli
[cli-url]: https://github.com/stdlib-js/string-ends-with/tree/cli
[@stdlib/string-ends-with]: https://github.com/stdlib-js/string-ends-with/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-ends-with/tree/deno
[deno-readme]: https://github.com/stdlib-js/string-ends-with/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/string-ends-with/tree/umd
[umd-readme]: https://github.com/stdlib-js/string-ends-with/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/string-ends-with/tree/esm
[esm-readme]: https://github.com/stdlib-js/string-ends-with/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/string-ends-with/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/string-ends-with/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
[mdn-string-endswith]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith
[@stdlib/string/starts-with]: https://www.npmjs.com/package/@stdlib/string-starts-with