Mike McClain wrote:
I've looked at this for a few days but still can't see 'why' I get what I do. Why do @arrays and @seconds not have the same number of elements? Thanks, Mike{ my %HoAoA = ( a => [ [ qw / aa1 aa2 / ], [ qw / ab1 ab2 / ] ], b => [ [ qw / ba1 ba2 / ], [ qw / bb1 bb2 / ], [ qw / bc1 bc2 / ] ], ); # this gets refs to all arrays my @arrays = map { @{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ] } keys %HoAoA ; # this only gets the second entry from the last array of each hash entry my @seconds = map { @{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ]->[1] } keys %HoAoA ; print "\...@arrays = @arrays\n"; print "\...@seconds = @seconds\n"; }
@{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ] is an array slice and OBJECT->[1] dereferences OBJECT as if it were an array and accesses the second element _however_ an array slice is not an array reference so this won't work. Why it returns the last element of the last array is beyond me. :-(
When you have ]->[ or ]->{ or }->[ or }->{ you can shorten that to ][ or ]{ or }[ or }{ which in your case will produce a syntax error.
John -- Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction. -- Albert Einstein -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
