Personally I like your last option. Keep all your config/constants/options where you can see 'em!
You may need others, they may grow 'til you need to put them in a separate file. If they're all together in one place this will be easier.
I would also check the variable.
"'$some_variable' can have the values 'x' and 'y' only."
Are you sure! Check it anyway. :-)
#!/usr/bin/perl
use strict;
use warnings;
my $config = {
count => {
x => 9,
y => 14,
},
other => {
a => 1,
b => 2,
}
};
my $some_variable = 'x';
die "bad count" unless exists $config->{count}{$some_variable};
for my $i (0 .. $config->{count}{$some_variable}) {
#do some stuff;
}
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