Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Re: How to remove duplicate key/value pairs in hash of array

by dws (Chancellor)
on Feb 20, 2001 at 23:20 UTC ( #59740=note: print w/replies, xml ) Need Help??


in reply to How to remove duplicate key/value pairs in hash of array

You can eliminate duplicate values by inverting the hash (turning key/value pairs into value/key pairs) and then re-inverting.
%hash = (a => 1, b => 1, c => 2); %hash = reverse %hash; # key/value -> value/key %hash = reverse %hash; foreach $key ( keys %hash ) { print $key, " => ", $hash{$key}, "\n"; }

Replies are listed 'Best First'.
Re^2: How to remove duplicate key/value pairs in hash of array
by bdalzell (Sexton) on Feb 04, 2009 at 15:18 UTC
    this works to remove duplicate values but if the keys are numeric it removes the lower numbered key value pairs. how would you remove the higher key numbered key value pairs retaining the key/value pair with the lowest value key?

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://59740]
help
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (6)
As of 2018-07-17 06:23 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?















    Results (355 votes). Check out past polls.

    Notices?