This goes right along with my problem. How can you tell how much memory
(RAM) the hash takes?
----- Original Message -----
From: "Doug Johnson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Monday, June 04, 2001 5:04 PM
Subject: RE: Find the number of elements in a hash.
> Perfect! Thanks a million..
>
> Doug
>
>
>
> --- Doug Johnson <[EMAIL PROTECTED]> wrote:
> > In an array to find the number of elements in an array I :
> >
> > print "$#array\n";
> >
> > Is there a similar way to find the number of keys in a hash without
> > cycling through them and without assigning the hash to an array?
>
> You can print the hash in a scalar context:
>
> %a = (a=>1,b=>2,c=>3);
> print scalar %a;
>
> This results in
>
> 3/8
>
> Which means there are 3 elements, and space has been allocated for 8.
>
> You can also do something like:
>
> %a = (a=>1,b=>2,c=>3);
> print scalar @{ [ %a ] } / 2;
>
> Since [ %a ] will creates an anonymous reference to an array containing
> all the keys AND values of %a, and evaluating that ref as an array in a
> scalar contaxt tells you how many elements there were. Dividing that by
> two gives you a count of the keys.
>
> I'd do the first one, and just split it on the slash.
>
> %a = (a=>1,b=>2,c=>3);
> ($elem) = split m[/], scalar %a;
> print "$elem\n";
>
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