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

Re: Removing array elements

by rjbs (Pilgrim)
on Aug 24, 2005 at 00:40 UTC ( #486058=note: print w/ replies, xml ) Need Help??


in reply to Removing array elements

(Update: the above solution using reverse is cooler and better than this one.

I would suggest using splice rather than delete for this purpose, but either way you're going to have to use something other than for over the array.

Like a lot of things the "three-part" or "C-style" for loop should be avoided in general, but used when needed. Don't feel that you must never use it.

my @foo = (1,2,2,1) x 5; my @bar = (2) x 20; for (my $i = 0; $i < @foo; $i++) { print "$i\n"; if ($foo[$i] % $bar[$i]) { splice @foo, $i, 1; $i-- } } print "@foo\n";
Because you're removing the element at $i when you use splice, you have to decrement it so that the next time you find the element that used to be at $i + 1. The splice will change the size of @foo, so the comparison in the for loop will refer to the current list size.
rjbs


Comment on Re: Removing array elements
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://486058]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (5)
As of 2015-07-03 20:28 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 (56 votes), past polls