Hash::Merge::Simple(3pm) - Man pages

Hash::Merge::Simple(3pUser Contributed Perl DocumentatHash::Merge::Simple(3pm)

NAME
       Hash::Merge::Simple - Recursively merge two or more hashes, simply

VERSION
       version 0.051

SYNOPSIS
           use Hash::Merge::Simple qw/ merge /;

           my $a = { a => 1 };
           my $b = { a => 100, b => 2};

           # Merge with righthand hash taking precedence
           my $c = merge $a, $b;
           # $c is { a => 100, b => 2 } ... Note: a => 100 has overridden => 1

           # Also, merge will take care to recursively merge any subordinate hashes found
           my $a = { a => 1, c => 3, d => { i => 2 }, r => {} };
           my $b = { b => 2, a => 100, d => { l => 4 } };
           my $c = merge $a, $b;
           # $c is { a => 100, b => 2, c => 3, d => { i => 2, l => 4 }, r => {} }

           # You can also merge more than two hashes at the same time
           # The precedence increases from left to right (the rightmost has the most precedence)
           my $everything = merge $this, $that, $mine, $yours, $kitchen_sink, ...;

DESCRIPTION
       Hash::Merge::Simple will recursively merge two or more hashes and
       return the result as a new hash reference. The merge function will
       descend and merge hashes that exist under the same node in both the
       left and right hash, but doesn't attempt to combine arrays, objects,
       scalars, or anything else. The rightmost hash also takes precedence,
       replacing whatever was in the left hash if a conflict occurs.

       This code was pretty much taken straight from Catalyst::Utils, and
       modified to handle more than 2 hashes at the same time.

USAGE
   Hash::Merge::Simple->merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
   Hash::Merge::Simple::merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
       Merge <hash1> through <hashN>, with the nth-most (rightmost) hash
       taking precedence.

       Returns a new hash reference representing the merge.

       NOTE: The code does not currently check for cycles, so infinite loops
       are possible:

           my $a = {};
           $a->{b} = $a;
           merge $a, $a;

       NOTE: If you want to avoid giving/receiving side effects with the
       merged result, use "clone_merge" or "dclone_merge" An example of this
       problem (thanks Uri):

           my $left = { a => { b => 2 } } ;
           my $right = { c => 4 } ;

           my $result = merge( $left, $right ) ;

           $left->{a}{b} = 3 ;
           $left->{a}{d} = 5 ;

           # $result->{a}{b} == 3 !
           # $result->{a}{d} == 5 !

   Hash::Merge::Simple->clone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
   Hash::Merge::Simple::clone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN> )
       Perform a merge, clone the merge, and return the result

       This is useful in cases where you need to ensure that the result can be
       tweaked without fear of giving/receiving any side effects

       This method will use Clone to do the cloning

   Hash::Merge::Simple->dclone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN>
       )
   Hash::Merge::Simple::dclone_merge( <hash1>, <hash2>, <hash3>, ..., <hashN>
       )
       Perform a merge, clone the merge, and return the result

       This is useful in cases where you need to ensure that the result can be
       tweaked without fear of giving/receiving any side effects

       This method will use Storable (dclone) to do the cloning

SEE ALSO
       Hash::Merge

       Catalyst::Utils

       Clone

       Storable

ACKNOWLEDGEMENTS
       This code was pretty much taken directly from Catalyst::Utils:

       Sebastian Riedel "sri@cpan.org"

       Yuval Kogman "nothingmuch@woobling.org"

AUTHOR
       Robert Krimen <robertkrimen@gmail.com>

COPYRIGHT AND LICENSE
       This software is copyright (c) 2010 by Robert Krimen.

       This is free software; you can redistribute it and/or modify it under
       the same terms as the Perl 5 programming language system itself.

perl v5.36.0                      2022-11-20          Hash::Merge::Simple(3pm)

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