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lib/Array/Join/OO.pm  view on Meta::CPAN

            merge => 'LEFT_PRECEDENT',
        }
    );

    my @rows = $join->join;

=head1 DESCRIPTION

C<Array::Join::OO> performs SQL-style joins over two Perl arrays.
Each array element is typically a hashref. Join keys are produced
by user-supplied callbacks.

The module supports C<inner>, C<left>, C<right>, and C<outer> joins
and multiple merge strategies for combining matching rows.

Multiple rows per key are supported; all matching combinations
are returned (Cartesian product).

=head1 CONSTRUCTOR

=head2 new( \@array_a, \@array_b, \%options )

lib/Array/Join/OO.pm  view on Meta::CPAN

The options hash must contain an C<on> key with exactly two
code references, one per array.

=head3 Options

=over 4

=item * on => [ sub {...}, sub {...} ]

Required. Two callbacks that extract a join key from items in
the left and right arrays respectively.

=item * type => 'inner' | 'left' | 'right' | 'outer'

Join type. Defaults to C<inner>.

=item * merge => STR | ARRAY | CODE

Controls how matching rows are combined.