If you want X if X is true, otherwise Y, that operator is usually written ||. The only reason to use X ? X : Y instead is when you want to evaluate X twice. But that's not what you want according to your description. So: 
$Target = Function($params) || $DefaultValue;

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In reply to Re: Perl ternary operator style by JavaFan
in thread Perl ternary operator style by David Clarke

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