---
name: "List::UtilsBy::XS"
section: "3pm"
platform: "linux"
package: "liblist-utilsby-xs-perl"
version: "0.06-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/List::UtilsBy::XS"
---

# List::UtilsBy::XS(3pm)

XS implementation of List::UtilsBy

## NAME

List::UtilsBy::XS - XS implementation of List::UtilsBy

## SYNOPSIS

```
  use List::UtilsBy::XS qw(sort_by);
  sort_by { $_->{foo} } @hash_ref_list
```

You can use those functions same as List::UtilsBy ones, but some functions have limitation. See LIMITATION section.

## DESCRIPTION

List::UtilsBy::XS is XS implementation of List::UtilsBy. Functions are more fast than original ones.

## FUNCTIONS

Same as List::UtilsBy

List::UtilsBy::XS implements following functions.

- sort\_by

  - nsort\_by

  - rev\_sort\_by

  - rev\_nsort\_by

  - max\_by (alias nmax\_by)

  - min\_by (alias nmin\_by)

  - uniq\_by

  - partition\_by

  - count\_by

  - zip\_by

  - unzip\_by

  - extract\_by

  - weighted\_shuffle\_by

  - bundle\_by

  ## LIMITATIONS

Some functions are implemented by lightweight callback API. `"sort_by"`, `"rev_sort_by"`, `"nsort_by"`, `"rev_nsort_by"`, `"min_by"`, `"max_by"`, `"nmin_by"`, `"nmax_by"`, `"uniq_by"`, `"partion_by"`, `"count_by"`, `"extract_by"`, `"weighted_shuffle_by"` are limited some features.

Limitations are:

### Don't change argument $\_ in code block

List::UtilsBy localizes `$_` in the code block, but List::UtilsBy::XS doesn't localize it and it is only alias same as `"map"`, `"grep"`. So you should not modify `$_` in callback subroutine.

### Can't access to arguments as @\_ in code block

You can access argument as only `$_` and cannot access as `@_`, `$_[n]`.

## AUTHOR

Syohei YOSHIDA \<syohex@gmail.com\>

## COPYRIGHT

Copyright 2013- Syohei YOSHIDA

## LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

## SEE ALSO

List::UtilsBy