> Message du 06/10/08 15:25
> De : "loody"
> A : "Perl beginners"
> Copie à :
> Objet : How to check empty hash value properly?
>
>
> Dear all:
> I want to use hash to keep my records.
> But before using it, I want to determine whether the value of the key exist?
> Below is my source code:
> if($hash{$key} eq "")
> {
> print "the value of the $key is empty\n";
> $hash{$key}=1;
> }
> else
> {
> $hash{$key}++;
> }
Shouldn't do that.
For checking if a hash key was there, use "exists":
if (exists $hash{$key} ) { do something }
In your case, for increasing a hash value, you don't need to initialize it.Just
say:
$hash{$key} ++;
If this pair of key/value doesn't exist, Perl will creat it for you silently.
Regards,
Jeff.
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