> On 11 Dec 2017, at 04:42, Sean McAfee <eef...@gmail.com> wrote: > > I think of %% as being Perl 6's is-divisible-by operator, so I was a little > surprised to discover this behavior: > > > 1 %% 0 > Attempt to divide 1 by zero using infix:<%%> > in block <unit> at <unknown file> line 1 > > The docs say a %% b is True if a % b is 0, so the error is as-designed, at > least. But mightn't it make more sense for %% to just return False when > given a second zero operand? After all, the answer to "is n divisible by > zero" is false for any n--there's no need to try to go through with the > division to ascertain this.
Note that x %% 0 returns a Failure ( https://docs.perl6.org/type/Failure ), which will be evaluated to False in a Boolean context. So it is already doing what you want. Only if you use it in a non-Boolean context, will the Exception of the Failure be thrown. say "foo" if 1 %% 0 # no output say "foo" unless 1 %% 0 # “foo” If you type in 1 %% 0 in the REPL, you are forcing evaluation of the Failure as a string because it will try to “say” it. say 1 %% 0 # Attempt to divide 1 by zero using infix:<%%> Hope this helps. Liz
