Re^2: Check/set hash of hashes value


laziness, impatience, and hubris
	PerlMonks

Re^2: Check/set hash of hashes value

by sammy_01 (Initiate)

on Jun 25, 2013 at 05:43 UTC ( [id://1040527]=note: print w/replies, xml )

Need Help??

in reply to Re: Check/set hash of hashes value
in thread Check/set hash of hashes value

You can use this way as well..

foreach $ip (keys(%subnets)) {
  if("$subnets{$ip}{'comment'}" eq "") {
      $subnets{$ip}{'comment'} = "ALLOCATED";
  }
  print "$subnets{$ip}{'comment'}\n";
}
[download]

Comment on Re^2: Check/set hash of hashes value Download Code

Replies are listed 'Best First'.

Re^3: Check/set hash of hashes value
by kennethk (Abbot) on Jun 25, 2013 at 15:47 UTC

exists

defined

If you use warnings, Perl will emit a warning every time you compare with an undefined value; it's a helpful tool to figure out if you've forgotten to initialize a variable. With your code and warnings, there would be a large amount of unnecessary noise on STDERR.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

[reply]

In Section Seekers of Perl Wisdom