You could simplify the comparison by upgrading your transformation. Instead of just splitting it into four pieces, why not convert it to dotless notation (i.e. the decimal representation of the underlying 32 bits). Comparing ips in dotless notation is trivial... a single <=> is all you need.

In general it makes sense to push the complexity into the transformation since it is only done once for each element in the list.

Something like: (warning untested) 

my @sorted_keys = map  {$_->[0]}
                  sort {$a->[1] <=> $b->[1]}
                  map  { [ $_, unpack("N",pack("C4",split(/\./,$_))) ]
+ }
                  keys %ip;

[download]
* I borrowed the ip => dotless conversion from Fletch's golf entry

-Blake

In reply to Re: Re: Re: Sorting a hash of IP addresses? by blakem
in thread Sorting a hash of IP addresses? by mnperez

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