> On Apr 11, 2017, at 6:13 AM, Mike Martin <m...@redtux.org.uk> wrote:
>
> Hi
>
> I have the following code as an example against a hash of hashes, to sort by
> hashrf key
>
> foreach my $opt (sort {uc($options{$b}->{type}) cmp uc($options{$a}->{type})}
> keys %options){
> my $type=$options{$opt}->{vtype};
> $video_type->append_text($type) if defined($type) ;
> }
>
> The sort function works perfectly, however perl throws up the following
> warning for each line
>
> Use of uninitialized value in uc at
>
> Any ideas how to get rid of the warning
Make sure that all $options{$key}->{type} values are defined:
foreach my $key ( keys %options ) {
$options{$key}->{type} = ‘’ unless defined $options{$key}->{type};
}
Substitute something else for ‘’ depending upon where you want to sort
undefined {type} values in your sort order.
Jim Gibson
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