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Do you know where your variables are?

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You can declare the keys as constants as you suggest, or use the lock_keys function from Hash::Util, which comes standard in recent perls. The latter will raise an exception at runtime if an non-existant key is set.

BTW, if you do use constants, an array is more efficient unless only a sparse set of keys are ever used at once:

use constant { K_AGE => 0, K_NAME => 1 }; my @record; $record[K_AGE] = 1001; $record[K_NAME] = 'Doraemon';
The difficulty in making hashes "strict" is just one of the reasons why many people dislike blessed-hashref object implementations.

Update: See also: non-autovivifing hash, how to avoid mis-spelling hash keys?.


In reply to Re: hash, a troublemaker? by blokhead
in thread hash, a troublemaker? by Doraemon

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