Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Re: map problem

by ForgotPasswordAgain (Deacon)
on Mar 09, 2012 at 22:51 UTC ( #958803=note: print w/ replies, xml ) Need Help??


in reply to map problem

Everyone already answered the problem. But another thing is I avoid using curly braces except when mapping to hashrefs. In this case:

my %y = map +( "prefix_$_" => 1 ), qw/a b c/;

As far as I know, using a block unnecessarily creates a lexical scope, which seems like a waste.

And speaking of waste, I notice you're pointing your hash to values of 1, probably intending to look at keys(%y) later. That's an unfortunate idiom if you ask me, as it points to a different copy of "1" every time. It's often better (though not important here for 3 values) to alias to undef if you're only concerned about getting a unique list of keys.


Comment on Re: map problem
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://958803]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (6)
As of 2015-07-06 22:26 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (83 votes), past polls