Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"

Re: number of keys and values in a hash

by biohisham (Priest)
on Oct 11, 2011 at 16:47 UTC ( #930856=note: print w/ replies, xml ) Need Help??

in reply to number of keys and values in a hash

As was indicated to you, using the 'keys' keyword in scalar context can tell you about how many keys are there in the hash, the number of values will be similar of course to the number of keys, but to have a count of values in a way that is more sensible you will need to filter out the undefined values and return only those that are defined, in this context, using grep in conjunction with defined is a good way to go

use strict; use warnings; my %hash = ( 'name'=>'hisham', 'keyword'=>undef, 'place'=>'the Monastery' ); my $key_count = keys %hash; my $value_count = grep {defined} values %hash; print $key_count,"\n"; print $value_count,"\n";

David R. Gergen said "We know that second terms have historically been marred by hubris and by scandal." and I am a two y.o. monk today :D, June,12th, 2011...

Comment on Re: number of keys and values in a hash
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://930856]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (5)
As of 2014-09-21 17:15 GMT
Find Nodes?
    Voting Booth?

    How do you remember the number of days in each month?

    Results (173 votes), past polls