Damian Conway writes:
>
> There's no second iterator. Just C walking through an array.
>
( questions in the form of answers :-)
so :
* "for" impose array context for first argument and doesnt care about
"nature" of the array which it was given eventually as an argument .
no multiple st
Austin Hastings wrote:
for each $dance: {
^ note colon
1- Why is the colon there? Is this some sub-tile syntactical new-ance
that I missed in a prior message, or a new thing?
It's the way we mark an indirect object in Perl 6.
2- Why is the colon necessary? Isn't the "
Arcadi wrote:
> > > > while <$iter> {...} # Iterate until $iter.each returns false?
> you mean "Iterate until $iter.next returns false?"
Oops. Quite so.
what is the difference between the Iterator and lazy array ?
am I right that it is just "interface" : lazy array is an iterator
> Larry wrote:
>
> So you can do it any of these ways:
>
> for <$dance> {
>
> for $dance.each {
>
> for each $dance: {
>^ note colon
1- Why is the colon there? Is this some sub-tile syntactical new-ance
that I missed in a prior message, or a new thing?
2- Why i
Damian Conway writes:
> David Wheeler asked:
>
> > How will while behave?
>
> C evaluates its first argument in scalar context, so:
>
>
> > while <$fh> {...}# Iterate until $fh.readline returns EOF?
>
> More or less. Technically: call <$fh.next> and execute the loop
> body i
On Monday, November 18, 2002, at 08:17 PM, Damian Conway wrote:
Sure. C always evaluates its condition in a scalar context.
Oh, duh. Thanks.
David
--
David Wheeler AIM: dwTheory
[EMAIL PROTECTED] ICQ: 15726394
http://david.w
David Wheeler asked:
while <$fh> {...}# Iterate until $fh.readline returns EOF?
That's a scalar context?
Sure. C always evaluates its condition in a scalar context.
Damian
On Monday, November 18, 2002, at 08:05 PM, Damian Conway wrote:
while <$fh> {...}# Iterate until $fh.readline returns EOF?
More or less. Technically: call <$fh.next> and execute the loop body
if that method
returns true. Whether it still has the automatic binding to $_ and the
implic
David Wheeler asked:
How will while behave?
C evaluates its first argument in scalar context, so:
while <$fh> {...}# Iterate until $fh.readline returns EOF?
More or less. Technically: call <$fh.next> and execute the loop body if that method
returns true. Whether it still has the au
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> Date: Tue, 19 Nov 2002 13:51:56 +1100
> From: Damian Conway <[EMAIL PROTECTED]>
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On Monday, November 18, 2002, at 06:51 PM, Damian Conway wrote:
for <$fh> {...}# Build and then iterate a lazy array (the elements
# of which call back to the filehandle's input
# retrieval coroutine)
for <$iter> {...} # Build and then iterate a lazy array (the elements
Larry wrote:
So you can do it any of these ways:
for <$dance> {
for $dance.each {
for each $dance: {
^ note colon
Then there's this approach to auto-iteration:
my @dance := Iterator.new(@squares);
for @dance {
Okay, so now I need to make sense of the
On Tue, Nov 19, 2002 at 08:53:17AM +1100, Damian Conway wrote:
: my $dance = Iterator.new(@squares);
: for $dance {
Scalar variables have to stay scalar in list context, so $dance cannot
suddenly start behaving like a list. Something must tell the scalar
to behave like a list, and I don't
--- Damian Conway <[EMAIL PROTECTED]> wrote:
> Austin Hastings asked:
> > That is, can I say
> >
> > for (@squares)
> > {
> > ...
> > if $special.instructions eq 'Advance three spaces'
> > {
> > $_.next.next.next;
> > }
> > ...
> > }
> >
> > or some other suchlike thing that will
Austin Hastings asked:
By extension, if it is NOT given an iterator object, will it appear to
create one?
Yep.
That is, can I say
for (@squares)
{
...
if $special.instructions eq 'Advance three spaces'
{
$_.next.next.next;
}
...
}
or some other suchlike thing that will enab
--- Damian Conway <[EMAIL PROTECTED]> wrote:
> The semantics of C would simply be that if it is given an
> iterator object (rather than a list or array), then it calls
> that object's iterator once per loop.
By extension, if it is NOT given an iterator object, will it appear to
create one?
That
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