Re^3: Print something when key does not exist

[NetWallah]

++ for asking good questions.

Yes the !@F handles blank lines. When split, these will leave the @F array unpopulated, so scalar(@F) will be 0, or false, and the line gets skipped.

The %h is a Hash of Hashes. the outer "for sort keys %h" handles the first (outer) hash.
Inside that, I use a "hash slice" to get an array of values for keys specified by @w (which is a sorted array).

This is pretty much the same thing kcott does in his line:

    map { $data{$name}{$_} || '' } @codes;

except - my code does not worry about non-existing keys - since I run without 'warnings', my code does the right thing without complaint.

[jaypal]

Thanks so much for your prompt response. Hash slice looks really handy. It effectively eliminated the need for two for loops I have in my answer.