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  1. or download this
    my @numbers = (0, 0.5, 1, 1.5, 2, 2.5);
    
    ...
    
    my @basket_1 = grep defined, @basket;
    print "The number of *defined* elements in \@basket is ", scalar(@bask
    +et_1), "\n";
    
  2. or download this
    my @numbers = (0, 0.5, 1, 1.5, 2, 2.5);
    
    ...
        push @basket_1, $_ if defined;
    }
    print "The number of *defined* elements in \@basket is ", scalar(@bask
    +et_1), "\n";
    
  3. or download this
    my @numbers = 1..10;
    my @times_ten = map { $_ * 10 } @numbers;
    print join(", ", @times_ten), "\n";