Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re: Is there a simple syntax to logically slice a hash?

by BrowserUk (Pope)
on Feb 21, 2013 at 15:49 UTC ( #1019970=note: print w/ replies, xml ) Need Help??


in reply to Is there a simple syntax to logically slice a hash?

I tend to do:

my %h2; /^cat/ and $h2{ $_ } = $h1{ $_ } for keys %h1;

Which might be seen as "cheating" as a one-liner; but it is often difficult to put the initialisation of a hash inline.

It is also quite more efficient than map and/or grep for larger hashes, by avoiding the creation of intermediate lists.


With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.


Comment on Re: Is there a simple syntax to logically slice a hash?
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1019970]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (6)
As of 2015-07-02 04:20 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 (27 votes), past polls