Well, having required something like this recently, I feel obliged to comment.

I particurly liked merlyn's solution: 

@copy = @$r;
while (my @pair = splice @copy, 0, 2) {
  push @$r2, [@pair];
}

[download]

However, I'll modify it slightly to show everyone what I came up with. (Maybe it's just me, but bit-wise operators always seem to pop-up in my code ... probably where they shouldn't :) 

@copy = @$r;
# I guess you know that your array will work for this, but
# it may be desirable to check (especially for n-'tuples')
# that the array is divisible by 2 (or n).  I guess that
# depending on what you're expecting this can be done on a
# all or nothing basis, or inside the loop

while (0..$#copy) {
  next if $_&1; # this skips all odds (you used a mod in
                # your original I think).  To expand to more
                # 'tuples', you'd have to change this to
                # next if $_%n
  push @$r2, [$copy[$_],$copy[$_+1]];
}

[download]

In reply to Re: Processing arrays 2 elements at a time (TIMTOWTDI) by dimmesdale
in thread Processing arrays 2 elements at a time (TIMTOWTDI) by grinder

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