Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

Re: How do I loop through a list two or more elements at a time?

by jeroenes (Priest)
on Oct 24, 2001 at 14:38 UTC ( #121069=note: print w/replies, xml ) Need Help??


in reply to How do I loop through a list two or more elements at a time?

my %hash = @list; print "$_ - $hash{$_}\n" for keys %hash;

Replies are listed 'Best First'.
Re: Answer: How do I loop through a list two or more elements at a time?
by Sidhekin (Priest) on Oct 24, 2001 at 15:34 UTC

    my %hash = @list will stringify the first of every pair of elements in the array, as well as remove all but the last of every pair, the first elements of which stringify to the same "key".

    ... plus, it is not easily generalizable to more than two elements at a time ...

    Okay, I guess I should make a suggestion as well:

    for (map{{el1=>$list[2*$_], el2=>$list[2*$_+1]}} 0 .. $#list/2) { # do things with $_->{el1} and $_->{el2} }

    In most cases this will be enough though (but I would not trust it with continue blocks):

    for (my $i=0 ; $i < @list ; $i+=2) { my ($el1, $el2) = @list[$i,$i+1]; # do things with $el1 and $el2 }

    Neither method aliases the list elements; to do that nicely you need a tie() or two. Or just work with references to or directly upon $list[$i] and $list[$i+1].

    The Sidhekin

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://121069]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (1)
As of 2021-10-25 21:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My first memorable Perl project was:







    Results (90 votes). Check out past polls.

    Notices?