Tanton,
I must be so close! I just can't get it to print the key value that
contains a null value. I think it is actually printing the value i.e
$hash{$hash_key} which is the value? I want it to print the key!
Does this sound correct to you?
Regards,
Dan
> foreach my $hash_key (keys %hash) {
> if( $hash{$hash_key} eq "" ) {
> print "\$hash{$hash_key} contains a null value!";
> }
> }
On Wed, 2002-04-10 at 16:07, Tanton Gibbs wrote:
> Sure, you just about have it, but don't use
> $hash{$_} == ""
> as someone else said, just use
> $hash{$_} eq ""
>
> Also, if you name your iterator $hash_key, then don't use $_, use
> $hash_key...so the final code would be
>
> foreach my $hash_key (keys %hash) {
> if( $hash{$hash_key} eq "" ) {
> print "\$hash{$hash_key} contains a null value!";
> }
> }
> ----- Original Message -----
> From: "Daniel Falkenberg" <[EMAIL PROTECTED]>
> To: "Tanton Gibbs" <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Wednesday, April 10, 2002 2:36 AM
> Subject: Re: Checking if a hash has blank values.
>
>
> > Hi Tanton,
> >
> > Yes, but what I really want it to do is go though all the values of the
> > hash and if any of them contain null values then print that out and tell
> > me whick key(s) value(s) contains null values? Is this possible?
> >
> > Therefore...
> >
> > foreach $hash_key (keys %hash) {
> > if ($hash{$_} == "" || $hash{$_} eq "") {
> > print $hash{$hash_key}, "Contains a null value!\n";
> > else {
> > print "It worked!\n";
> > }
> > }
> >
> > Thx,
> >
> > Dan
> >
> >
> > On Wed, 2002-04-10 at 15:52, Tanton Gibbs wrote:
> > > If you want to test all of them, you can say
> > >
> > > $hash{$_} eq "" and die "Empty hash!" foreach( keys %hash );
> > > ----- Original Message -----
> > > From: "Eric Beaudoin" <[EMAIL PROTECTED]>
> > > To: "Daniel Falkenberg" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> > > Sent: Wednesday, April 10, 2002 2:22 AM
> > > Subject: Re: Checking if a hash has blank values.
> > >
> > >
> > > > At 02:08 2002.04.10, you wrote:
> > > > >Hey all,
> > > > >
> > > > >I have created a hash that looks similar to the following...
> > > > >
> > > > >%hash (
> > > > > 'test1' => $test1,
> > > > > 'test2' => $test2,
> > > > > 'test3' => $test3,
> > > > >);
> > > > >
> > > > >Now is it possible to have a little piece of code check the values of
> > > > >that hash and see if their are any blank fields?
> > > > >
> > > > >Something like...
> > > > >
> > > > >if ($hash($_) eq "" || $hash($_) == ""}
> > > > > print "These hash keys $hash($_) did not contain any data!\n";
> > > > >} else {
> > > > > print "It worked!";
> > > > >}
> > > > >
> > > > >Regards,
> > > > >
> > > > >Dan
> > > >
> > > > Hashes use the {}, not the ().
> > > >
> > > > $hash{$_} == "" is not right. == is for numerical comparaison so perl
> > > automagicaly transform each side to a number before resolving the ==.
> > > >
> > > > This means that "a" == "b" returns true and "This is a value" == ""
> also
> > > returns true. Not what you want I beleive.
> > > >
> > > > Your first test ($hash{$_} eq "") should work like you intend it.
> > > >
> > > > You can be lazy and test like this
> > > >
> > > > if($hash{$_}) then { print "There is a value\n" }
> > > >
> > > > if you know in advance that none of your value can be the number or
> the
> > > string "0".
> > > >
> > > > Hope this helps.
> > > >
> > > >
> > > > ----------------------------------------------------------
> > > > �ric Beaudoin <mailto:[EMAIL PROTECTED]>
> > > >
> > > >
> > > > --
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