On Sun, 30 Sep 2018, 12:05 ToddAndMargo, <toddandma...@zoho.com> wrote:
> Hi All, > > https://docs.perl6.org/routine/join#(List)_routine_join > > method join(List:D: $separator --> Str:D) > > $ p6 'say (1, <a b c>).join("|");' > 1|a b c > > > In this instance you have passed in two objects the Int 1 and a list of > Str's <a b c> (<> being similar to qw () in perl5. Join works on Str's to > the first thing it does is convert each of the two parameters to Str, the > default Str conversion for a list is space separated hence "a b c" which is > then joined with "1" to get "1|a b c" > > > It states in the manual that this will happen. > > Questions: > > 1) why? > > 2) where in the method definition does it state > this will happen? > > 3) why does this work? > $ p6 'join( "|", <1 2 3>).say;' > 1|2|3 > > In this case the join sub will be using the + slurpy so it's flattening > the given input into it's parameter list and then joining it. > > Many thanks, > -T > I think you really want to get a solid understanding of signatures, they are what gives Perl6 a lot of it's flexibility. Unlike Perl5 where many functions have special rules handling input in Perl6 a lot of it is done with Signatures. Simon >
