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Re: Global variable vs passing variable from sub to sub

by dragonchild (Archbishop)
on Sep 13, 2004 at 16:15 UTC ( #390593=note: print w/replies, xml ) Need Help??

in reply to Global variable vs passing variable from sub to sub

I seriously hope I don't have to describe to you the plethora of perils encountered when using global variables. Bugs are notoriously difficult to track down and the code generally devolves into a mess.

That said, selective usage of global variables can often be a big benefit to a program's maintainability. For example, most session implementations in web applications are glorified global variables. Using a sessionstore can significantly reduce the amount of tramp data that goes on the URL.

Often, specific variables are maintained globally, such as $dbh. With proper documentation, I don't see a problem with this. I would (and do) prefer using a singleton instead of an explicit global, just so that new usages can be easily added. But, styles differ.

We are the carpenters and bricklayers of the Information Age.

Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose

I shouldn't have to say this, but any code, unless otherwise stated, is untested

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Re^2: Global variable vs passing variable from sub to sub
by kiat (Vicar) on Sep 13, 2004 at 16:45 UTC
    Thanks, dragonchild!

    I'm aware of the mess having lots of globals can create so I generally try to keep them to the minimal.

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