# stri_sort_key: Sort Keys

## Description

This function computes a locale-dependent sort key, which is an alternative character representation of the string that, when ordered in the C locale (which orders using the underlying bytes directly), will give an equivalent ordering to the original string. It is useful for enhancing algorithms that sort only in the C locale (e.g., the strcmp function in libc) with the ability to be locale-aware.

## Usage

stri_sort_key(str, ..., opts_collator = NULL)


## Arguments

str

a character vector

...

additional settings for opts_collator

opts_collator

a named list with ICU Collator’s options, see stri_opts_collator, NULL for default collation options

## Details

For more information on ICU’s Collator and how to tune it up in stringi, refer to stri_opts_collator.

See also stri_rank for ranking strings with a single character vector, i.e., generating relative sort keys.

## Value

The result is a character vector with the same length as str that contains the sort keys. The output is marked as bytes-encoded.

## Author(s)

Marek Gagolewski and other contributors

## References

Collation - ICU User Guide, https://unicode-org.github.io/icu/userguide/collation/

stri_sort_key(c('hladny', 'chladny'), locale='pl_PL')