On Thu, Sep 27, 2018 at 2:49 AM ToddAndMargo <toddandma...@zoho.com> wrote:
> On 9/26/18 4:33 PM, The Sidhekin wrote: > > On Wed, Sep 26, 2018 at 11:40 PM ToddAndMargo <toddandma...@zoho.com > > <mailto:toddandma...@zoho.com>> wrote: > > > And where is it stated what goes in the () and what goes > > in the []? > > > > > > The () is part of a method call syntax; method arguments go there: > > https://docs.perl6.org/language/syntax#Subroutine_calls > > Where does it state that > > $ p6 '"a b c d e".words(3).say;' > (a b c) > > means the first three words, starting at zero? > https://docs.perl6.org/routine/words#class_Str says it returns "the same as a call to $input.comb( / \S+ /, $limit ) would". https://docs.perl6.org/routine/comb#class_Str says it "returns a list of non-overlapping matches limited to at most $limit matches". It doesn't say it returns the first such matches; maybe it should. It doesn't say "starting at zero", but then, why should it? The first three wouldn't be the first three if it skipped any, right? > > > The [] is a postcircumfix operator; index arguments go there: > > https://docs.perl6.org/language/operators#postcircumfix_[_] > > Where does > > multi method words(Str:D $input: $limit = Inf --> Positional) > > state that I can do such? > It doesn't. https://docs.perl6.org/language/operators#postcircumfix_[_] does. > I ask this because not all methods will take [] > Sure they will. They might give you runtime errors, if the method doesn't (at runtime) return something that does Positional, but they will all take it. > Also, where is it stated that > > $ p6 '"a b c d e".words(3)[ 2, 4 ].say;' > (c Nil) > > will send the first three words to [2,4] ? > It doesn't. It shouldn't: There's no "sending". https://docs.perl6.org/language/operators#postcircumfix_[_] tells you it calls postcircumfix:<[ ]> with a first argument of what the returned (the first three words) and the remaining positional arguments 2, 4. Eirik
