On Wed, 30 May 2001, E. Alan Hogue wrote:
...
> foreach $field (@fld_vals) {
> while ($field = '') {
> push (@nulls,$id);
> }
> }
>
> My idea was that $id would be, for instance, the
> primary key value so that I could go look at the
> record later.
>
> Well, it didn't do what I wanted, but what really
> confuses me is what it actually did. When I went
> through the program in the debugger, it looked like my
> while statement was actually _assigning_ '' to each
> element of @fld_vals, thereby erasing the data in that
> array.
>
> Can anyone tell me why it did this?
It does that because = is the assignment operator.
If you want to compare strings you want to use the eq operator, eg:
foreach $field (@fld_vals) {
if ($field eq '') {
# I assume these are defined somewhere else
push (@nulls,$id);
}
}
For a complete description of perls operators, see perldoc perlop.
--
Tony
