Hi Joe,
So I had a chance to play with hashes further, and I noticed something
that you might be interested in. It seems that 'bare' declaration of a
hash with a "my" lexical scope enables you to stash away multiple
'hash' elements at the top level using a 'curly brace' syntax. However
using the 'fat arrow' syntax will overwrite any previously stashed
'top level' hash elements.
Hopefully the REPL code below illustrates. First, 'curly brace' syntax:
mbook:~ homedir$ perl6
To exit type 'exit' or '^D'
> my @monsters = << godzilla grendel wormface blob fingfangfoom tingler >>;
[godzilla grendel wormface blob fingfangfoom tingler]
> my @rocks = << marble sandstone granite chert pumice limestone >>
[marble sandstone granite chert pumice limestone]
> my %stash
{}
> %stash{'monsters'} = @monsters
[godzilla grendel wormface blob fingfangfoom tingler]
> say %stash
{monsters => [godzilla grendel wormface blob fingfangfoom tingler]}
> %stash{'rocks'} = @rocks
[marble sandstone granite chert pumice limestone]
> say %stash
{monsters => [godzilla grendel wormface blob fingfangfoom tingler],
rocks => [marble sandstone granite chert pumice limestone]}
> exit
mbook:~ homedir$
[and now try 'fat arrow' syntax]
mbook:~ homedir$ perl6
To exit type 'exit' or '^D'
> my @monsters = << godzilla grendel wormface blob fingfangfoom tingler >>;
[godzilla grendel wormface blob fingfangfoom tingler]
> my @rocks = << marble sandstone granite chert pumice limestone >>
[marble sandstone granite chert pumice limestone]
> my %stash
{}
> %stash = monsters => @monsters
{monsters => [godzilla grendel wormface blob fingfangfoom tingler]}
> %stash = rocks => @rocks
{rocks => [marble sandstone granite chert pumice limestone]}
> say %stash
{rocks => [marble sandstone granite chert pumice limestone]}
> say %stash<monsters>
(Any)
> exit
mbook:~ homedir$ perl6 -v
This is Rakudo version 2019.07.1 built on MoarVM version 2019.07.1
implementing Perl 6.d.
HTH, Bill.
On Thu, Mar 5, 2020 at 6:10 PM Joseph Brenner <doom...@gmail.com> wrote:
>
> William Michels <w...@caa.columbia.edu> wrote:
>
> > Yes, since I was working in the REPL, I tried compacting Joe's code by
> > eliminating the "my %stash" line at the top, and adding "my" to the third
> > line.
>
> I noticed the additional "my" in there, but I wouldn't have been able
> to tell you why it was behaving like it was...
>
> On the plus side, I see that if you tried to do that in a script, it
> would warn you:
>
> Potential difficulties:
> Redeclaration of symbol '%stash'
