> -----Original Message-----
> From: Troy Denkinger [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, August 14, 2001 9:58 AM
> To: John Sands; [EMAIL PROTECTED]
> Subject: Re: how many items in a hash?
>
>
> On Tuesday 14 August 2001 10:36, John Sands wrote:
> > Is there a simple way to know whether a hash has items in
> it? Like using
> > @ARRAY in a scalar context gives the size of an array. Or
> using $#ARRAY
> > gives the last valid index.
>
> Calling keys() on the hash will return a list of the keys in
> the hash.
> Calling scalar() on that list will give you the number of
> elements in the
> list.
Or, from perldoc perldata:
If you evaluate a hash in scalar context, it returns false if the hash
is empty. If there are any key/value pairs, it returns true; more
precisely, the value returned is a string consisting of the number of
used buckets and the number of allocated buckets, separated by a
slash.
print "Empty!\n" unless %myhash;
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