Re: [perl #130038] Builtin variable for loop index in foreach

On Mon, Nov 28, 2016 at 08:53:34AM +0000, Dave Mitchell wrote:
> On Mon, Nov 28, 2016 at 08:14:23PM +1300, Kent Fredric wrote:
> > At parse time, the Perl compiler parsing the for { } block *lexically*
> > parses for a variable ( we'll just say $# for now ).
> > 
> > And then upon detecting that variable's usage in its block, then instruments
> > the for loop to behave differently.
> 
> what about:
> 
>     for (...) {
>         eval '$#';
>     }

Another approach would be to extend the for syntax, e.g.

    for       -> $i    (....) { say "$i: $_" }
    for $x    -> my $i (....) { say "$i: $x" }
    for my $x -> my $i (....) { say "$i: $x" }

for a suitable bikeshedding of '->'.

-- 
Indomitable in retreat, invincible in advance, insufferable in victory
    -- Churchill on Montgomery

• [perl #130038] Builtin variable for loop index in foreach by Ed Avis
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• Re: [perl #130038] Builtin variable for loop index in foreach by Aristotle Pagaltzis
• Re: [perl #130038] Builtin variable for loop index in foreach by Kent Fredric
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• Re: [perl #130038] Builtin variable for loop index in foreach by Kent Fredric
• Re: [perl #130038] Builtin variable for loop index in foreach by Kent Fredric
• [perl #130038] Builtin variable for loop index in foreach by Hugo van der Sanden via RT
• Re: [perl #130038] Builtin variable for loop index in foreach by Zefram
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• [perl #130038] Builtin variable for loop index in foreach by Ed Avis via RT
• RE: [perl #130038] Builtin variable for loop index in foreach by Ed Avis
• Re: [perl #130038] Builtin variable for loop index in foreach by demerphq
• Re: [perl #130038] Builtin variable for loop index in foreach by Dave Mitchell
• RE: [perl #130038] Builtin variable for loop index in foreach by Ed Avis