Hi

I picked some examples from https://perl6advent.wordpress.com/2013/12/21/day-21-signatures/ but am not sure if they are still valid syntax, because of confusion with Synopsies S06

named parameters

call syntax
     sub doctor(:$number, :$prop) {
         say "Doctor # $number liked his $prop";
     }

     doctor(:prop("cricket bat"), :number<5>);

[download]

Could this call also be written as

doctor( prop => "cricket bat" , number => 5)

?

internal names

But when defining another internal name it shouldn't be possible to write

sub doctor(:$prop => $internal) { ... , right?

rather

sub doctor(:$prop($internal) ) { ... , right?

mandatory named arguments

Talking about mandatory named parameters where do I place the ! then?

sub doctor(:$prop! => $internal)

resp

sub doctor(:$prop($internal)! ) { ... , right?

or

sub doctor(:$prop!($internal) ) { ... , right?

==== default values

And when defining a default value, where do I place it?

sub doctor(:$prop($internal) = 'something ) { ... ' , right?

==== why optional inverted default for named

BTW positional arguments are by default mandatory and become optional when a default value is provided.

But named arguments are by default optional, why not the same trick?

where constraints

use v6;
multi odd-or-even(Int $i where * %% 2) { say "even" };
multi odd-or-even(Int $i) { say "odd"};

[download]

apparently means something like sub { $_ % 2 } .

why two %% and is it possible to use a more familiar P5 syntax here? like where {$x % 2} ?

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

In reply to (Perl6) Signatures by LanX

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