Front page | perl.perl6.language |
Postings from May 2005
Matt Fowles wrote:
>All~
>
>What does the reduce metaoperator do with an empty list?
>
>my @a;
>[+] @a; # 0? exception?
>[*] @a; # 1? exception?
>[<] @a; # false?
>[||] @a; # false?
>[&&] @a; # true?
>
>Also if it magically supplies some correct like the above, how does it
>know what that value is?
>
>
My general thoughts has been that:
[op] @list
behaves something like:
eval join(op, @list)
so feeding it an empty list would return undef, regardless of op.
Similarly, if @list is just one element, it returns that element.
-- Rod Adams
Thread Previous