I suppose taking references might save memory, but it doesn't save any time over this (on small or large lists): sub shuffle {
my @a=@_;
my $n;
my $ret;
my $i=@_;
map {
$n = rand($i--);
$ret = $a[$n];
$a[$n] = $a[$i];
$ret;
} @_;
}
I get about 16% better than the List::Util version (YMMV).
Update: Aha. It's large data being shuffled, not large lists, that makes List::Util the better answer in some instances. Thanks ikegami.
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