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Answer: How to deal with undefined returned variables.
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Q&A > subroutines > How to deal with undefined returned variables. contributed by Boldra

Russ mentioned that the // operator is in Perl 6, but in fact it is available in Perl 5.10: 
use 5.010;
$CONFIG{HASHTYPE} = $cfg->val("MISC","HASHTYPE") // 'sha1';

[download]
This only puts 'sha1' in your config value if your $cfg->val returns undef or nothing.

Definitely a valuable addition to the language.

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