Too many Reimanns & Not enough role? -jas
On 18 January 2016 at 11:37, Elizabeth Mattijsen <l...@dijkmat.nl> wrote: > >> On 18 Jan 2016, at 19:55, Tom Browder <tom.brow...@gmail.com> wrote: >> >> In creating some new Perl 6 programs I've run across several instances >> I'm confused about, to wit: >> >> Example 1 >> --------------- >> >>> my %h; say 'false' if !%h<a>:exists; >> Unexpected named parameter 'exists’ passed > > Yeah, this is an unexpected one. However, there is a simple solution: > > my %h; say 'false' if %h<a>:!exists; > > In general, :foo is equivalent to foo => True, and :!foo is equivalent to foo > => False. > > >> Example 2 >> --------------- >> >>> my %h; say 'false' if not %h<a>:exists; >> false >> >> It looks like '!' doesn't work as I thought it was supposed to. But, >> I just discovered that when I use parens, it works. > > Yes, the ! binds closer, and eats the :exists, and then complains about it. > > > > Liz
