What is the better method for using hash??

[sonet]

How to compare the memory usage??What is the better??

(A)
hash1{TYPE1}{VALUE1}='A';
hash1{TYPE1}{VALUE2}='B';
hash1{TYPE1}{VALUE3}='C';
hash1{TYPE2}{VALUE1}='1';

or
(B)
TYPE1{VALUE1}='A';
TYPE1{VALUE2}='B';
TYPE1{VALUE2}='C';
TYPE2{VALUE1}='1';

How can i do that (A) hash keys as refs?

 

[Gunnar Hjalmarsson]

How to compare the memory usage??What is the better??

(A)
hash1{TYPE1}{VALUE1}='A';
hash1{TYPE1}{VALUE2}='B';
hash1{TYPE1}{VALUE3}='C';
hash1{TYPE2}{VALUE1}='1';

or
(B)
TYPE1{VALUE1}='A';
TYPE1{VALUE2}='B';
TYPE1{VALUE2}='C';
TYPE2{VALUE1}='1';

How can i do that (A) hash keys as refs?

perldoc perlreftut
perldoc perlref

 

[xhoster]

How to compare the memory usage??

I'd do it by measuring their memory usages (on a large enough sample), and
then comparing them. I find this to be convenient if not very portable:
print +(`ps -p $$ -o rss `)[1];

What is the better??

(A)
hash1{TYPE1}{VALUE1}='A';
hash1{TYPE1}{VALUE2}='B';
hash1{TYPE1}{VALUE3}='C';
hash1{TYPE2}{VALUE1}='1';

or
(B)
TYPE1{VALUE1}='A';
TYPE1{VALUE2}='B';
TYPE1{VALUE2}='C';
TYPE2{VALUE1}='1';

Neither is better. A is a syntax error, and B has nothing to do with
hashes (and is also a syntax error if you use strict).

Xho