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I am using unpack to unpack an element that consists of a 32 byte hex string plus an optional unsigned integer. If the integer exists, I want to join the 2 with an underscore.

I tried:
join("_", unpack("H32V*", $string));
but it always performs the join even if there is no second element. Adding an intermediate assignment, made it work:
my @temp = unpack("H32V*", $string); join("_", @temp);
But that seems kludgy and I would like to avoid it. So, is there any way to properly cast/assign the result of unpack so that an undefined second element is ignored by join without using an intermediate variable?

In reply to Casting return value of unpack properly by puterboy

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