the code that I consider as being the easiest for a non-expert to read is also the fastest

Although, note that it probably would not be the fastest inline: 
my @copy = @$r;
while( @copy ) {
    push @$r2, [ shift @copy, shift @copy ];
}

[download]
It is only the artifact of using @_ in the sub call which avoids the copy.

  p

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

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