Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Re^3: Hash assignments using map

by japhy (Canon)
on Feb 25, 2007 at 14:03 UTC ( #601996=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Hash assignments using map
in thread Hash assignments using map

Right. My point is, why not loop over the elements in @keepers, rather than the keys of the other hash?

my %big_hash = (...); my @to_keep = ('abc', 'xyz'); %big_hash = map { exists($big_hash{$_}) ? ($_ => $big_hash{$_}) : () } + @to_keep; # or %big_hash = map { $_ => $big_hash{$_} } grep { exists $big_hash{$_} } +@to_keep;

Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart


Comment on Re^3: Hash assignments using map
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://601996]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (5)
As of 2015-07-04 05:40 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 (57 votes), past polls