time-to-botec/squiggle/node_modules/@stdlib/string/right-trim-n/README.md

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# rtrimN

> Trim `n` characters from the end of a string.

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## Usage

```javascript
var rtrimN = require( '@stdlib/string/right-trim-n' );
```

#### rtrimN( str, n\[, chars] )

Trims `n` characters from the end of a string.

```javascript
var str = '  foo  ';
var out = rtrimN( str, str.length );
// returns '  foo'

out = rtrimN( str, 1 );
// returns '  foo '
```

By default, the function trims whitespace characters. To trim a different set of characters instead, provide a string or an array of characters to trim:

```javascript
var str = '🐶🐶🐶 Animals 🐶🐶🐶';
var out = rtrimN( str, str.length, [ '🐶', ' ' ] );
// returns '🐶🐶🐶 Animals'

out = rtrimN( str, str.length, '🐶 ' );
// returns '🐶🐶🐶 Animals'
```

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## Examples

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

```javascript
var rtrimN = require( '@stdlib/string/right-trim-n' );

var out = rtrimN( '   Whitespace   ', 3 );
// returns '   Whitespace'

out = rtrimN( '\t\t\tTabs\t\t\t', 2 );
// returns '\t\t\tTabs\t'

out = rtrimN( '~~~CUSTOM~~~', 3, '~' );
// returns '~~~CUSTOM'
```

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* * *

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## CLI

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### Usage

```text
Usage: rtrimn [options] --n=<number>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --n number            Number of characters to trim.
         --chars str           Characters to trim. Default: whitespace.
         --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.
```

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### Notes

-   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 $'   foo   \n   bar   ' | rtrimn --n=3 --split /\r?\n/

    # Escaped...
    $ echo -n $'   foo   \n   bar   ' | rtrimn --n=3 --split /\\r?\\n/
    ```

-   The implementation ignores trailing delimiters.

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### Examples

```bash
$ rtrimn '   Whitespace   ' --n=3
   Whitespace
```

To use as a [standard stream][standard-streams],

```bash
$ echo -n '~beep~boop~~~' | rtrimn --n=2 --chars '~'
~beep~boop~
```

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 '~~~foo~~~\t~~~bar~~~\t~~~baz~~~' | rtrimn --split '\t' --chars '~' --n=3
~~~foo
~~~bar
~~~baz
```

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[mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

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

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