From Greg.London@infineon.com

Current format for a lazily evaluated list​:

  my $lazylist = (0, { $_ + 3 } ...^ * > 10);

^*> is incoherent line noise.

Please consider making a builtin function that looks kind of like a "for loop" but is lazily evaluated.

my $lazylist = lazy ($_=0; $_ <= 10; $_+=3);

The syntax for a FOR() loop is well established and already has everything needed to define a lazy list.
(start condition; end condition; increment condition)

Keep the line noise version if you want, but a lazy() function would be much more natural and intuitive for oddball situations and would need almost zero explanation.

From @coke

On Mon Feb 22 14​:43​:21 2016, Greg.London@​infineon.com wrote​:

Current format for a lazily evaluated list​:

my $lazylist = (0, { $_ + 3 } ...^ * > 10);

^*> is incoherent line noise.

Thanks for trying out Perl 6.

In case this wasn't just a rant, the ^ here is tied to the sequence, and means
exclude the endpoint. For example, 1...^4 produces a three element sequence.

The * is a Whatever star, and is ubiquitous in Perl 6. It's a way to generate
a closure; * > 10 here means "something greater than 10". So altogether,
...^ * > 10 should read, a sequence up to , but not including, a value greater than 10.

So, as it turns out, this isn't really a list that needs lazifying, it's only got
4 elements​: 0, 3, 6, 9. The 12 is greater than 10, so we take everything up to but
not including it.

Please consider making a builtin function that looks kind of like a
"for loop" but is lazily evaluated.

my $lazylist = lazy ($_=0; $_ <= 10; $_+=3);

The syntax for a FOR() loop is well established and already has
everything needed to define a lazy list.
(start condition; end condition; increment condition)

In Perl 6, the C-style for loop you reference is spelled "loop".

loop (my $i = 0; $i < 10; $i++) { say $i } # prints out 0 to 9.

Keep the line noise version if you want, but a lazy() function would
be much more natural and intuitive for oddball situations and would
need almost zero explanation.

Turns out we already have a "lazy". So this code works today.

my $lazylist = lazy loop (my $i=0; ; $i++) { $i };
say $lazylist[1000];

Rejecting ticket. I encourage you to checkout docs.perl6.org
and/or stop by on the irc channel if you have more questions.

--
Will "Coke" Coleda

The RT System itself - Status changed from 'new' to 'open'

@coke - Status changed from 'open' to 'rejected'