Bryan Harris wrote:
> > > I'd like to concatenate two variables--
> > >
> > > $newVar = $old1 . $old2;
> > >
> > > -- where $old1 might be undefined. Is there any way to set a
> > > flag so that this just results in $old2 instead of the compiler
> > > throwing an error?
> >
> > The concatenation operator will work fine with an undefined value.
> > It's one of the cases where the interpreter will substitute an
> > empty string instead of throwing an error.
>
> That's good to know...
>
> It looks like I've over-simplified. I'm "concatenating" two
> variables into a list:
>
> $newTxt[$row] = [ @{$numTxt[$row]}, "\t" x ($nextCol -
$#{$numTxt[$row]}), @temp ];
>
> I'd like result to be @temp if $numTxt[$row] is undefined, and that
> whole mess if it isn't. It seems like this should be done without an
> if/then, but I can't see how.
Without any fancy stuff it goes like this:
if (defined my $hash = $numTxt[$row]) {
$newTxt[$row] = [
@{$numTxt[$row]},
("\t") x ($nextCol - $#{$numTxt[$row]})
];
} else {
$newTxt[$row] = [ @temp ];
}
Note the parentheses around "\t". If you leave these off you get a
single
string containing the given number of tab characters instead of an array
of single tabs.
HTH,
Rob
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