I am by no means an initiate of the Dark Mysteries™ of random numbers (Update: see reply below of BrowserUk), but here's a possibly interesting use of an iterator:
>perl -wMstrict -le
"use List::Util qw(shuffle);
;;
sub Iterator (&) { return $_[0]; }
;;
sub rand_iter {
my $total = shift;
;;
my $random = [ shuffle 0 .. $total-1 ];
;;
return Iterator {
my $n = shift;
return if $n < 0 or $n > @$random;
return splice @$random, 0, $n;
}
}
;;
my $iter = rand_iter(9);
;;
use Data::Dump;
dd [ $iter->(0) ];
dd [ $iter->(5) ];
dd [ $iter->(4) ];
dd [ $iter->(1) ];
dd [ $iter->(2) ];
"
[]
[5, 4, 0, 2, 8]
[7, 3, 6, 1]
[]
[]
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