I don't know the map function. Teddy, [EMAIL PROTECTED]
----- Original Message ----- From: "drieux" <[EMAIL PROTECTED]> To: "cgi cgi-list" <[EMAIL PROTECTED]> Sent: Monday, May 20, 2002 7:25 AM Subject: Re: Counting the elements of an array On Sunday, May 19, 2002, at 06:29 , Octavian Rasnita wrote: > I couldn't understand anything, but thank you very much! :-) my apologies - how can I help make it more understandable? > I could use the other solutions very easy, but now I have another problem. better a solution than None! > I should try to understand your code. [..] > http://www.wetware.com/drieux/pbl/BenchMarks/uniqCounts.txt > > ok, so my OCD is benchmarking - but I would like to offer > what I think may be a bit quicker - if speed is your Need... > > #------------------------ > # > sub haveMap { > my (@list) = @_; > my %seen = (); > > map {$seen{$_}++} @list; > > \%seen ; > > } # end of haveMap this is a bit of squirrelly code in the sense that one has to feel at home with map, cf perldoc -f map and to be honest - to me it is VOODOO - I really do not get it... in this case map {$seen{$_}++} @list; would unwrap as for(@list) { $seen{$_} += 1; } or more verbose it would read as for(@list) { if (exists($seen{$_}) { # if such a thing is there increment it my $tmp = $seen{$_}; $seen{$_} = $tmp + 1 ; }else{ # else assign it an initial value of one $seen{$_} = 1 ; } } as long as you can cope with the idea of (undef + 1) == 1 which is the initial condition - and we avoid it because the '++' operator in this case is 'majikal'.... ciao drieux --- -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
