What you've got there is called a Dispatch Table and it is a useful (and common) technique. I'm sure you can pull up some interesting nodes via Super Search if you look for that term.

I would change this line in your code: 

$ret = &{$options{$opt}};

[download]

To this: 

$ret = $options{$opt}->();

[download]

a) Is it worth using?

Definitely. It's a great way to handle a large number of options, IMHO.

b) Is this will be taken as a 'bad style' example?

It's a standard technique, so as long as you've got some comments explaining that it's a dispatch table it's fine.

c) Is if-elsif-elsif-elsif-else chain more efficient than this?

It might be, depending on how many options there are. Hash lookups are roughly constant-time operations, whereas a chain of if-elsif-else blocks would increase in time for every new condition added. Further, dividing separate tasks up into small subs is far better from a maintenance standpoint than a gigantic conditional structure.

Update: Expanded answer a bit.

In reply to Re: Hash option/menu loop wierd or usefull? by friedo
in thread Hash option/menu loop wierd or usefull? by mulander

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