1Array::Diff(3)        User Contributed Perl Documentation       Array::Diff(3)
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NAME

6       Array::Diff - Find the differences between two arrays
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SYNOPSIS

9           my @old = ( 'a', 'b', 'c' );
10           my @new = ( 'b', 'c', 'd' );
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12           my $diff = Array::Diff->diff( \@old, \@new );
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14           $diff->count   # 2
15           $diff->added   # [ 'd' ];
16           $diff->deleted # [ 'a' ];
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DESCRIPTION

19       This module compares two arrays and returns the added or deleted
20       elements in two separate arrays.  It's a simple wrapper around
21       Algorithm::Diff.
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23       And if you need more complex array tools, check Array::Compare.
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METHODS

26       new ()
27           Create a new "Array::Diff" object.
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29       diff ( OLD, NEW )
30           Compute the differences between two arrays.  The results are stored
31           in the "added", "deleted", and "count" properties that may be
32           examined using the corresponding methods.
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34           This method may be invoked as an object method, in which case it
35           will recalculate the differences and repopulate the "count",
36           "added", and "removed" properties, or as a static method, in which
37           case it will return a newly-created "Array::Diff" object with the
38           properies set appropriately.
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40       added ( [VALUES ] )
41           Get or set the elements present in the "NEW" array and absent in
42           the "OLD" one at the comparison performed by the last "diff()"
43           invocation.
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45       deleted ( [VALUES] )
46           Get or set the elements present in the "OLD" array and absent in
47           the "NEW" one at the comparison performed by the last "diff()"
48           invocation.
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50       count ( [VALUE] )
51           Get or set the total number of added or deleted elements at the
52           comparison performed by the last "diff()" invocation.  This count
53           should be equal to the sum of the number of elements in the "added"
54           and "deleted" properties.
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SEE ALSO

57       Algorithm::Diff
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AUTHOR

60       Daisuke Murase <typester@cpan.org>
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63       Copyright (c) 2009 by Daisuke Murase.
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65       This program is free software; you can redistribute it and/or modify it
66       under the same terms as Perl itself.
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68       The full text of the license can be found in the LICENSE file included
69       with this module.
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73perl v5.28.0                      2010-10-08                    Array::Diff(3)
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