Re^5: check possible combination of sum using given array

I have just learnt a new word, thanks! but a word totally irrelevant here AFAIC.

My motivation was to exit the sub in the most efficient way, the equivalent of C's void sub(){ ... return; }. But there are contexts in Perl ... so perhaps return undef; or return 0; is a better/more efficient way. If not, then at least as far as showing intentions, it must be better. So, your remark was beneficial to me.

Comment on Re^5: check possible combination of sum using given array Select or Download Code

Replies are listed 'Best First'.
Re^6: check possible combination of sum using given array by karlgoethebier (Abbot) on Jul 11, 2019 at 14:44 UTC
Wait. This is not about efficiency. I guess it’s more about what our founders used to call flexibility. I sometimes wrote things like this: `sub nose { my $cuke = shift; 1 if $cuke; return; }` [download] This should work as well: `sub nose { my $cuke = shift; 1 if $cuke; undef; }` [download] And i‘m pretty sure that you are aware that `return undef;` AKA `return;` isn’t the same as `return 0;`. But it may be that I even forgot this issue because of lack of practice. Code not tested because of vacation. Hence no warranty 🤪. Best regards, Karl «The Crux of the Biscuit is the Apostrophe» `perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'`Help	[reply] [d/l] [select]
Re^7: check possible combination of sum using given array by choroba (Cardinal) on Jul 11, 2019 at 16:44 UTC
> isn’t the same Even `return` and `return undef` aren't the same. `sub plain { return } sub Undef { return undef } my @empty = plain(); my @nonempty = Undef(); die 'Different' unless @empty == @nonempty;` [download] `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l] [select]
Re^8: check possible combination of sum using given array by karlgoethebier (Abbot) on Jul 11, 2019 at 18:02 UTC
Wow! (No kidding). This is jesuitisch raffiniert. I wonder what might happen when it’s `sub kgb {undef}`. 🤪 Probably nothing special. Works as designed. Best regards, Karl «The Crux of the Biscuit is the Apostrophe» `perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'`Help J	[reply] [d/l] [select]