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

Re^3: correct angle on tackling a problem

by roboticus (Canon)
on Aug 24, 2012 at 22:43 UTC ( #989651=note: print w/ replies, xml ) Need Help??


in reply to Re^2: correct angle on tackling a problem
in thread correct angle on tackling a problem

diamondsandperls:

He means logic like:

my %seen; for my $key (0 1 2 1 2 3 2 3 4 3 4 5) { print $key unless $seen{$key}++; }

This (untested) script should just print the values 0 through 5 in order. The $key value is just the data you use to tell whether it's identical or not. When you first check the %seen hash for the value 0, there won't be an entry for zero, so the print will execute. The line also increments the value in the %seen hash to 1, so the next time you see 0 it *won't* print.

You just need the %seen hash, the data you use for the $key, and an action you want to control.

...roboticus

When your only tool is a hammer, all problems look like your thumb.


Comment on Re^3: correct angle on tackling a problem
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://989651]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (5)
As of 2014-07-12 21:19 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    When choosing user names for websites, I prefer to use:








    Results (241 votes), past polls