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Re^4: Nested Data Structures, OOP

by programmer.perl (Beadle)
on Jul 24, 2012 at 14:30 UTC ( #983429=note: print w/replies, xml ) Need Help??

in reply to Re^3: Nested Data Structures, OOP
in thread Nested Data Structures, OOP

Hi Ken,

The grep function helped me to delete the elements of an array. In my book (Perl by Example 4th edit.) there is no format of grep function, which you show me:

@x = grep { $_ ne q{b} } @x;

In the book, there is only one format: grep(EXPR,LIST). I used your format and it is working :-). Both calls: with single or multiple arguments are working:

$student1->drop_courses(["C++"]); $student1->drop_courses(["C++", "Bio"]);

Here is the final script of a sub:

sub drop_courses { # drop_courses(["",]); my $self=shift; my $del_cour = shift; # $del_cour = ["Java"]; my $num = @{$del_cour}; if ($num == 1) { @{$self->{'Course(s)'}->{'cour'}} = grep { $_ ne $del_cour->[0] } @{$self->{'Course(s)'}->{'cour'}}; print "After dropping: ", join (", ", @{$self->{'Course(s)'}->{'cour'}}), "\n"; } elsif ($num > 1) { for ($i=0; $i<$num; $i++) { @{$self->{'Course(s)'}->{'cour'}} = grep { $_ ne $del_cour->[$i] } @{$self->{'Course(s)'}->{'cour'}}; } } print "After dropping: ", join (", ", @{$self->{'Course(s)'}->{'cour'}}), "\n"; }
Thank you, Ken!

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[ambrus]: again? someone complained about this just a few days ago (although eventually they could post)
[choroba]: Can you post the question in mz2255's scratchpad?
[ambrus]: Corion, if you're here, can you check the spam filter logs to see what's triggering this time?
[ambrus]: Petroza had trouble posting yesterday, but has posted Issues Fetching URL with a variable token since.
[mz2255]: Yes, just edited the scratchpad. Not sure if I'm doing something wrong, it's my first time.

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