SYNOPSIS

    use Array::Set qw(set_diff set_symdiff set_union set_intersect);

    set_diff([1,2,3,4], [2,3,4,5]);            # => [1]
    set_diff([1,2,3,4], [2,3,4,5], [3,4,5,6]); # => [1]
    set_diff({ignore_case=>1}, ["a","b"], ["B","c"]);   # => ["a"]

    set_symdiff([1,2,3,4], [2,3,4,5]);            # => [1,5]
    set_symdiff([1,2,3,4], [2,3,4,5], [3,4,5,6]); # => [1,6]

    set_union([1,3,2,4], [2,3,4,5]);            # => [1,3,2,4,5]
    set_union([1,3,2,4], [2,3,4,5], [3,4,5,6]); # => [1,3,2,4,5,6]

    set_intersect([1,2,3,4], [2,3,4,5]);            # => [2,3,4]
    set_intersect([1,2,3,4], [2,3,4,5], [3,4,5,6]); # => [3,4]

DESCRIPTION

   This module provides routines for performing set operations on arrays.
   Set is represented as a regular Perl array. All comparison is currently
   done with eq (string comparison) so currently no support for
   references/objects/undefs. You have to make sure that the arrays do not
   contain duplicates/undefs.

   Characteristics and differences with other similar modules:

     * simple functional (non-OO) interface

     * functions accept more than two arguments

     * option to do case-insensitive comparison

     * option to ignore blanks

     * preserves ordering

FUNCTIONS

   All functions are not exported by default, but exportable.

set_diff([ \%opts ], \@set1, ...) => array

   Perform difference (find elements in the first set not in the other
   sets). Accept optional hashref as the first argument for options. Known
   options:

     * ignore_case => bool (default: 0)

     If set to 1, will perform case-insensitive comparison.

     * ignore_blanks => bool (default: 0)

     If set to 1, will ignore blanks (" foo" == "foo" == "f o o").

set_symdiff([ \%opts ], \@set1, ...) => array

   Perform symmetric difference (find elements in the first set not in the
   other set, as well as elements in the other set not in the first).
   Accept optional hashref as the first argument for options. See set_diff
   for known options.

set_union([ \%opts ], \@set1, ...) => array

   Perform union (find elements in the first or in the other, duplicates
   removed). Accept optional hashref as the first argument for options.
   See set_diff for known options.

set_intersect([ \%opts ], \@set1, ...) => array

   Perform intersection (find elements common in all the sets). Accept
   optional hashref as the first argument for options. See set_diff for
   known options.

SEE ALSO

   See some benchmarks in Bencher::Scenarios::ArraySet.

   App::setop to perform set operations on lines of files on the
   command-line.

   Array::Utils, Set::Scalar, List::MoreUtils (uniq for union, singleton
   for symmetric diff), Set::Array, Array::AsObject, Set::Object,
   Set::Tiny.

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