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Though I'm not quite sure how tests 3-5 are supposed to go
Neither was I! So I made it die (a.k.a throws an exception) when the array consists only of NULLs. Garbage in, garbage out, as we used to say. Exceptions prevent the garbage leaking out.

If you decide it should do something other than die, just change this line:

die "No values found" if @arr && 0 == grep $_ ne '_', @arr;

In reply to Re^3: Filling in missing values in an array by FunkyMonk
in thread Filling in missing values in an array by dhuang90

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