Re: The Bad, the Ugly, and the Good of autovivification

[tall_man]

I'm finding misspelled keys enough of a problem in my applications that I'm considering drastic solutions like Tie::Hash::FixedKeys for critical hashes where I know the keys in advance.

use strict;
use Tie::Hash::FixedKeys;
my %a : FixedKeys( qw(a b) );
%a = (a => 1, b=> 2);

print "Doesn't exist\n" unless exists($a{c});
print "Also Doesn't exist\n" unless exists($a{c}->{d});
print "Oh, my, not good\n" if exists($a{c});

The attempted autovivification on line 7 will cause a croak.