I agree with you. But I don't understand why you are ignoring my point that I am trying to make. The point regards the answer that gets the highest amount of votes regards using map and grep in favor of using hash slices!

I don't know what you mean with 'edge cases' but if you mean checking for hashes or undefined values they can easily be added with some simple if then else statements. E.g.:

    if ( !defined $n->{ $_ } && exists $f->{ $_ } ) { print "Hello a undefined value was detected\n" ; }

2018-06-09 Athanasius restored node content

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