In answer to "why the : between Str:D and Cool:D and why Int(Cool:D) ?" can
I just point out the video I linked (or the slides) which answer both of
these questions.
On Wed, 12 Sep 2018 at 06:29 ToddAndMargo <toddandma...@zoho.com> wrote:
> On 09/11/2018 03:09 AM, ToddAndMargo wrote:
> > multi method contains(Str:D: Cool:D $needle, Int(Cool:D) $pos)
> >
> > Okay, I know that
> > Str is a string
> > Cool is an object that can be treated as both a string and a number
> > $needle is the second optional parameter
> >
> > What is "D"?
> >
> > $needle is optional, why is it not stated as "$needle?"
> >
> > How is both Str:D: and Cool:D the first parameter?
> >
> > Why does "Str:D:" have a colon on the end and "Cool:D" does not?
> >
> > What is Int(Cool:D) ?
> >
> > What is $pos ?
> >
> > Where is it stated that it has a return a value?
> >
> > Where is it state that the return value is a boolean?
> >
> > Yours in confusion,
> > -T
>
> First off, I band the heck out of "contains" all over my code.
> I know how it works. What I don't know is how the documentation
> got there.
>
> Okay I am making progress.
>
> "multi method contains" means that it is a "method" (.foo).
> Perl 6 has "methods" `.foo` and subroutines `sub foo(...){...}`
>
> "Str:D" means it reads a string Str.contains(...) and
> that the string is mandatory (constrained).
>
> Okay, foul!
> Str:D: Cool:D $needle
> why is there not a comma between "Str:D:" and "Cool:D"?
> And what is with the extra ":". By chance is the extra ":"
> a confusing way of using a comma for a separator?
>
> "Cool:D $needle" means that sub string or number you are
> looking for. And it is constrained. You must enter a value.
>
> Foul again!
> Int(Cool:D) $pos
> Why "Int(Cool:D)"? Why is type Int being redefined
> as type "Cool" (number or any type or a string).
>
> $pos is the starting position to check for a match,
> start at zero.
>
> Foul!
> $pos is optional. But there is a "D" in its definition
> making it constrained and not optional.
>
> And another foul!
> There is no stating what the return value is. It
> should be of single value of type Bool.
>
> I am getting there. Thank you all for the help.
>
> -T
>
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> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Computers are like air conditioners.
> They malfunction when you open windows
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
--
Simon Proctor
Cognoscite aliquid novum cotidie
