NAME
Sort::Key - Perl extension for sorting objects by some key
SYNOPSIS
use Sort::Key qw(keysort nkeysort ikeysort);
@by_name = keysort { "$_->{surname} $_->{name}" } @people;
@by_age = nkeysort { $_->{age} } @people;
@by_sons = ikeysort { $_->{sons} } @people;DESCRIPTION
Sort::Key provides a set of functions to sort object arrays by some (calculated) key value.
Usually, it is faster and uses less memory than other alternatives implemented around perl sort function.
EXPORT
None by default.
Functions available from this module are:
- keysort { CALC_KEY } @array
-
returns the elements on
@arraysorted by the key calculated applying{ CALC_KEY }to them.Inside
{ CALC_KEY }, the object is available as$_.For example:
@a=({name=>john, surname=>smith}, {name=>paul, surname=>belvedere}); @by_name=keysort {$_->{name}} @a; - lkeysort { CALC_KEY } @array
-
similar to keysort but takes into account locale configuration when comparing keys.
- nkeysort { CALC_KEY } @array
-
similar to keysort but compares the keys numerically instead of as strings.
- ikeysort { CALC_KEY } @array
-
similar to keysort but automatically converts the keys to integer values and compares them numerically.
SEE ALSO
perl sort function
AUTHOR
Salvador Fandiño, <sfandino@yahoo.com>
COPYRIGHT AND LICENSE
Copyright (C) 2005 by Salvador Fandiño
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.4 or, at your option, any later version of Perl 5 you may have available.