ZlR:
I sometimes use this trick: Rather than reference the top hash everywhere, I create a reference to the "current" hash in each level of the loop, like so:
#!/usr/bin/perl -w
use strict;
use warnings;
my %rez = (
'host1' => {
'tgt' => {
'target_0011' => {
'11C3' => '0C5C',
'11E3' => '0C7C'
},
},
'wwn' => [ 'foobar' ]
},
);
for my $curHost (keys %rez) {
my $host = $rez{$curHost}; # Use $$host{key} at this level
print "HOST: $curHost\n";
for my $curDev (keys %{$$host{tgt}}) {
my $dev = $$host{tgt}{$curDev}; # Use $$dev{key} at this level
# without using trick:
my $bar = $rez{$curHost}{tgt}{$curDev}{'11E3'};
# with trick:
my $foo = $$dev{'11C3'};
print " DEV $curDev contains: ", join(", ", sort keys %$dev
+), "\n";
}
}
This way, your references aren't a foot and a half long. You can easily add or remove a level of your structure pretty easily, too, since you needn't edit a bazillion lines of code--only the ones where you change levels. I normally use this trick when (a) I suspect that I'll have to rearrange the structure or (b) my references get too long.
...roboticus
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