Re^5: Smartmatch alternatives

[Laurent_R]

If you don't have any, it is easy to implement it using the reduce function of List::Utils with something like this:

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

Or, better:

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

which makes it possible to call it with a syntax similar to grep:

<strike>print "true\n" if any { $_> 11 } qw /3 12 4 5 7/; # prints tru
+e

Update: the above line need to be this:

print "true\n" if any { $_> 11 } 0, qw /3 12 4 5 7/; # prints true

[LanX]

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

[Laurent_R]

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.

[Laurent_R]

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) } @_;
}

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, @_;
}