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It's good to see you're paying attention to deprecation warnings.

You can use the splice function to remove elements from an array. Here's an example:

$ perl -Mstrict -Mwarnings -E ' my @x = qw{a b c}; say "@x"; splice @x, 1, 1; say "@x"; ' a b c a c

If you know the value you want to delete but not the array index of that value, grep may be a better option:

$ perl -Mstrict -Mwarnings -E ' my @x = qw{a b c}; say "@x"; @x = grep { $_ ne q{b} } @x; say "@x"; ' a b c a c

Also, an empty list will not add elements to the array, e.g.

$ perl -Mstrict -Mwarnings -E ' my @x = ( qw{a}, (), qw{c} ); say "@x"; ' a c

You might use this feature in, for instance, a map statement. This example shows discarding certain values and modifying the remainder:

$ perl -Mstrict -Mwarnings -E ' my @x = qw{a b c}; say "@x"; @x = map { $_ ne q{b} ? uc : () } @x; say "@x"; ' a b c A C

You may also find the following modules useful:

  • List::Util - A selection of general-utility list subroutines.
    This is a builtin module; you should have it already.
  • List::MoreUtils - Provide the stuff missing in List::Util.
    This is a CPAN module; you may need to install it.

-- Ken

In reply to Re^5: Nested Data Structures, OOP by kcott
in thread Nested Data Structures, OOP by programmer.perl

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