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.\" ========================================================================
.\"
.IX Title "Hash::MoreUtils 3pm"
.TH Hash::MoreUtils 3pm "2015-05-31" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
Hash::MoreUtils \- Provide the stuff missing in Hash::Util
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&  use Hash::MoreUtils qw(slice slice_def slice_exists slice_grep
\&                         hashsort
\&                        );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Similar to \f(CW\*(C`List::MoreUtils\*(C'\fR, \f(CW\*(C`Hash::MoreUtils\*(C'\fR
contains trivial but commonly-used functionality for hashes.
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
.ie n .SS """slice"" HASHREF[, \s-1LIST\s0]"
.el .SS "\f(CWslice\fP HASHREF[, \s-1LIST\s0]"
.IX Subsection "slice HASHREF[, LIST]"
Returns a hash containing the (key, value) pair for every
key in \s-1LIST.\s0
.PP
If no \f(CW\*(C`LIST\*(C'\fR is given, all keys are assumed as \f(CW\*(C`LIST\*(C'\fR.
.ie n .SS """slice_def"" HASHREF[, \s-1LIST\s0]"
.el .SS "\f(CWslice_def\fP HASHREF[, \s-1LIST\s0]"
.IX Subsection "slice_def HASHREF[, LIST]"
As \f(CW\*(C`slice\*(C'\fR, but only includes keys whose values are
defined.
.PP
If no \f(CW\*(C`LIST\*(C'\fR is given, all keys are assumed as \f(CW\*(C`LIST\*(C'\fR.
.ie n .SS """slice_exists"" HASHREF[, \s-1LIST\s0]"
.el .SS "\f(CWslice_exists\fP HASHREF[, \s-1LIST\s0]"
.IX Subsection "slice_exists HASHREF[, LIST]"
As \f(CW\*(C`slice\*(C'\fR but only includes keys which exist in the
hashref.
.PP
If no \f(CW\*(C`LIST\*(C'\fR is given, all keys are assumed as \f(CW\*(C`LIST\*(C'\fR.
.ie n .SS """slice_grep"" \s-1BLOCK,\s0 HASHREF[, \s-1LIST\s0]"
.el .SS "\f(CWslice_grep\fP \s-1BLOCK,\s0 HASHREF[, \s-1LIST\s0]"
.IX Subsection "slice_grep BLOCK, HASHREF[, LIST]"
As \f(CW\*(C`slice\*(C'\fR, with an arbitrary condition.
.PP
If no \f(CW\*(C`LIST\*(C'\fR is given, all keys are assumed as \f(CW\*(C`LIST\*(C'\fR.
.PP
Unlike \f(CW\*(C`grep\*(C'\fR, the condition is not given aliases to
elements of anything.  Instead, \f(CW%_\fR is set to the
contents of the hashref, to avoid accidentally
auto-vivifying when checking keys or values.  Also,
\&'uninitialized' warnings are turned off in the enclosing
scope.
.ie n .SS """slice_map"" HASHREF[, \s-1MAP\s0]"
.el .SS "\f(CWslice_map\fP HASHREF[, \s-1MAP\s0]"
.IX Subsection "slice_map HASHREF[, MAP]"
Returns a hash containing the (key, value) pair for every
key in \f(CW\*(C`MAP\*(C'\fR.
.PP
If no \f(CW\*(C`MAP\*(C'\fR is given, all keys of \f(CW\*(C`HASHREF\*(C'\fR are assumed mapped to theirself.
.ie n .SS """slice_def_map"" HASHREF[, \s-1MAP\s0]"
.el .SS "\f(CWslice_def_map\fP HASHREF[, \s-1MAP\s0]"
.IX Subsection "slice_def_map HASHREF[, MAP]"
As \f(CW\*(C`slice_map\*(C'\fR, but only includes keys whose values are
defined.
.PP
If no \f(CW\*(C`MAP\*(C'\fR is given, all keys of \f(CW\*(C`HASHREF\*(C'\fR are assumed mapped to theirself.
.ie n .SS """slice_exists_map"" HASHREF[, \s-1MAP\s0]"
.el .SS "\f(CWslice_exists_map\fP HASHREF[, \s-1MAP\s0]"
.IX Subsection "slice_exists_map HASHREF[, MAP]"
As \f(CW\*(C`slice_map\*(C'\fR but only includes keys which exist in the
hashref.
.PP
If no \f(CW\*(C`MAP\*(C'\fR is given, all keys of \f(CW\*(C`HASHREF\*(C'\fR are assumed mapped to theirself.
.ie n .SS """slice_grep_map"" \s-1BLOCK,\s0 HASHREF[, \s-1MAP\s0]"
.el .SS "\f(CWslice_grep_map\fP \s-1BLOCK,\s0 HASHREF[, \s-1MAP\s0]"
.IX Subsection "slice_grep_map BLOCK, HASHREF[, MAP]"
As \f(CW\*(C`slice_map\*(C'\fR, with an arbitrary condition.
.PP
If no \f(CW\*(C`MAP\*(C'\fR is given, all keys of \f(CW\*(C`HASHREF\*(C'\fR are assumed mapped to theirself.
.PP
Unlike \f(CW\*(C`grep\*(C'\fR, the condition is not given aliases to
elements of anything.  Instead, \f(CW%_\fR is set to the
contents of the hashref, to avoid accidentally
auto-vivifying when checking keys or values.  Also,
\&'uninitialized' warnings are turned off in the enclosing
scope.
.ie n .SS """hashsort"" [\s-1BLOCK,\s0] \s-1HASHREF\s0"
.el .SS "\f(CWhashsort\fP [\s-1BLOCK,\s0] \s-1HASHREF\s0"
.IX Subsection "hashsort [BLOCK,] HASHREF"
.Vb 2
\&  my @array_of_pairs  = hashsort \e%hash;
\&  my @pairs_by_length = hashsort sub { length($a) <=> length($b) }, \e%hash;
.Ve
.PP
Returns the (key, value) pairs of the hash, sorted by some
property of the keys.  By default (if no sort block given), sorts the
keys with \f(CW\*(C`cmp\*(C'\fR.
.PP
I'm not convinced this is useful yet.  If you can think of
some way it could be more so, please let me know.
.ie n .SS """safe_reverse"" [\s-1BLOCK,\s0] \s-1HASHREF\s0"
.el .SS "\f(CWsafe_reverse\fP [\s-1BLOCK,\s0] \s-1HASHREF\s0"
.IX Subsection "safe_reverse [BLOCK,] HASHREF"
.Vb 1
\&  my %dup_rev = safe_reverse \e%hash
\&
\&  sub croak_dup {
\&      my ($k, $v, $r) = @_;
\&      exists( $r\->{$v} ) and
\&        croak "Cannot safe reverse: $v would be mapped to both $k and $r\->{$v}";
\&      $v;
\&  };
\&  my %easy_rev = save_reverse \e&croak_dup, \e%hash
.Ve
.PP
Returns safely reversed hash (value, key pairs of original hash). If no
\&\f(CW\*(C`BLOCK\*(C'\fR is given, following routine will be used:
.PP
.Vb 6
\&  sub merge_dup {
\&      my ($k, $v, $r) = @_;
\&      return exists( $r\->{$v} )
\&             ? ( ref($r\->{$v}) ? [ @{$r\->{$v}}, $k ] : [ $r\->{$v}, $k ] )
\&             : $k;
\&  };
.Ve
.PP
The \f(CW\*(C`BLOCK\*(C'\fR will be called with 3 arguments:
.ie n .IP """key""" 8
.el .IP "\f(CWkey\fR" 8
.IX Item "key"
The key from the \f(CW\*(C`( key, value )\*(C'\fR pair in the original hash
.ie n .IP """value""" 8
.el .IP "\f(CWvalue\fR" 8
.IX Item "value"
The value from the \f(CW\*(C`( key, value )\*(C'\fR pair in the original hash
.ie n .IP """ref\-hash""" 8
.el .IP "\f(CWref\-hash\fR" 8
.IX Item "ref-hash"
Reference to the reversed hash (read-only)
.PP
The \f(CW\*(C`BLOCK\*(C'\fR is expected to return the value which will used
for the resulting hash.
.SH "AUTHOR"
.IX Header "AUTHOR"
Hans Dieter Pearcey, \f(CW\*(C`<hdp@cpan.org>\*(C'\fR,
Jens Rehsack, \f(CW\*(C`<rehsack@cpan.org>\*(C'\fR
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs or feature requests to
\&\f(CW\*(C`bug\-hash\-moreutils@rt.cpan.org\*(C'\fR, or through the web interface at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Hash\-MoreUtils>.
I will be notified, and then you'll automatically be notified of progress on
your bug as I make changes.
.SH "SUPPORT"
.IX Header "SUPPORT"
You can find documentation for this module with the perldoc command.
.PP
.Vb 1
\&    perldoc Hash::MoreUtils
.Ve
.PP
You can also look for information at:
.IP "\(bu" 4
\&\s-1RT: CPAN\s0's request tracker
.Sp
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Hash\-MoreUtils>
.IP "\(bu" 4
AnnoCPAN: Annotated \s-1CPAN\s0 documentation
.Sp
<http://annocpan.org/dist/Hash\-MoreUtils>
.IP "\(bu" 4
\&\s-1CPAN\s0 Ratings
.Sp
<http://cpanratings.perl.org/d/Hash\-MoreUtils>
.IP "\(bu" 4
Search \s-1CPAN\s0
.Sp
<http://search.cpan.org/dist/Hash\-MoreUtils/>
.SH "ACKNOWLEDGEMENTS"
.IX Header "ACKNOWLEDGEMENTS"
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright 2005 Hans Dieter Pearcey, all rights reserved.
Copyright 2010\-2013 Jens Rehsack
.PP
This program is free software; you can redistribute it and/or modify it
under the terms of either: the \s-1GNU\s0 General Public License as published
by the Free Software Foundation; or the Artistic License.
.PP
See http://dev.perl.org/licenses/ for more information.