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Re: random elements from array - new twist

by PodMaster (Abbot)
on Nov 05, 2002 at 09:55 UTC ( #210417=note: print w/replies, xml ) Need Help??


in reply to random elements from array - new twist

Oh my ... shuffle this, splice that ... how's this?
use strict; BEGIN{eval q{use warnings;}} { my %cache; sub Gimme { my( $arr, $n, $clear, $all ) = @_; my @ret = (); $cache{$arr} = {} if defined $clear or not exists $cache{$arr} +; %cache = () if defined $all; while($n){ my $rand = $$arr[rand@$arr]; unless(exists $cache{$arr}{$rand}){ $n--; $cache{$arr}{$rand}++; push @ret, $rand; } if( scalar %{$cache{$arr}} == @$arr ) { warn "No more unique elements left in $arr"; return @ret; } } return @ret; } } my @array = ( 1..10,'a'..'z',keys %:: ); #my($c1, $c2, $c3, $c4, $c5 ) = Gimme(\@array,5); for(1..10){ print "\n\n=head1 $_\n\n"; print "\t$_\n" for Gimme(\@array, 5); } __END__

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