Re^6: Smartmatch alternatives

your any is always true!

  DB<12> use List::Util qw/reduce/

  DB<13> sub any(&@) {
               my $code_ref = shift;
               reduce { $a or $code_ref->(local $_ = $b) } @_;
           }

  DB<15> print "true\n" if any { $_ < 0 } qw /3 12 4 5 7/;
true
[download]

Cheers Rolf

( addicted to the Perl Programming Language)

Comment on Re^6: Smartmatch alternatives Select or Download Code

Replies are listed 'Best First'.
Re^7: Smartmatch alternatives by Laurent_R (Canon) on Dec 18, 2013 at 00:08 UTC
Oops, you are absolutely right. I must have changed something at the last moment, and don't remember exactly what. It was working OK, but not anymore. I am too tired now to figure out what happened, it will have to be tomorrow. I tested it with various arrays, it was working perfectly alright. But it's no longer the case.	[reply]
Re^7: Smartmatch alternatives by Laurent_R (Canon) on Dec 18, 2013 at 15:55 UTC
OK, to work correctly, the first element of the array passed to `any` needs to be false. There are two ways of doing it, I tested both ways, but then I made the mistake of removing both ways from my post. It can be done either as in the update I made in my post above (prepending a 0 to the list passed to any) or by changing the `any` function as follows: `sub any (&@) { my $code_ref = shift; unshift @_, 0; reduce { $a or $code_ref->(local $_ = $b) } @_; }` [download] Thank you Rolf for your remark. Update: It could also be done this way, perhaps the best one: `sub any (&@) { my $code_ref = shift; reduce { $a or $code_ref->(local $_ = $b) } 0, @_; }` [download]	[reply] [d/l] [select]