Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation

Re^3: comparing two array

by citromatik (Curate)
on Jun 17, 2009 at 12:54 UTC ( #772385=note: print w/ replies, xml ) Need Help??

in reply to Re^2: comparing two array
in thread comparing two array

In this case...

print defined $h{$elem} ? "Yes" : "No"; print exists $h{$elem} ? "Yes" : "No"; print $h{$elem} ? "Yes" : "No";

Are all equivalent (give the same result). exists returns true if the specified element in the hash has ever been initialized, even if its current value is undefined. In this case, all elements has been initialized to 1. If you undefine one element of the hash, for example undef $h{$elem}, then $h{$elem} still exists, but its value is undef


Comment on Re^3: comparing two array
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://772385]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (9)
As of 2015-11-25 14:28 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (677 votes), past polls