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Re^2: Global Vars

by tbone1 (Monsignor)
on Sep 04, 2009 at 13:57 UTC ( #793461=note: print w/ replies, xml ) Need Help??


in reply to Re: Global Vars
in thread Global Vars

What he said. I have sometimes created a global hash (called something like %my_global_values or something like that) so that 1) it's obvious what is a global variable, and 2) I'm far less likely to accidentally reuse a variable.

And the quick and dirty programs probably last longer because expectations are lower, they're for (relatively) simple things, and developers are less likely to overthink them.

--
tbone1, YAPS (Yet Another Perl Schlub)
And remember, if he succeeds, so what.
- Chick McGee


Comment on Re^2: Global Vars
Re^3: Global Vars
by roboticus (Canon) on Sep 04, 2009 at 15:01 UTC
    tbone1:

    Nice technique. It seems to me that it's a handy step on the way to splitting things off into modules and/or object-oriented bits. Since all the references go through your global hash anyway, when you split off a function/module/object, the code in your subroutines wouldn't have to change much:

    BEFORE

    my %my_global_values = (foo=>0, etc=>0); my $rGlobals = \%my_global_values; sub zigafoo { $rGlobals-> = 7 }
    AFTER
    package barbaz; my %my_package_values = (foo=>0); my $rPackage = \%my_package_values; sub foobar { $rPackage->{foo} = 7; }

    ...roboticus

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