29 Sep
2015
29 Sep
'15
9:37 p.m.
Completely intentional. 'all' tests whether the predicate is true for all elements; if there are no elements, it's vacuously true (cf. forall quantifier in logic). On 9/29/2015 11:33 PM, Lana Black wrote:
Hello,
Is there any particular reason why the 'all' function returns True when supplied with an empty list (or any other foldable)? I'm aware that it is implemented via All monoid instance, my question is whether this behaviour is intentional or it can be considered a bug. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe