Damian Conway writes:
There's no second iterator. Just Cfor 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
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
object
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
Damian Conway writes:
David Wheeler asked:
How will while behave?
Cwhile 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
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 is the colon
--- Damian Conway [EMAIL PROTECTED] wrote:
The semantics of Cfor 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
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
--- 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 enable me to consistently
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
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 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
#
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Date: Tue, 19 Nov 2002 13:51:56 +1100
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David Wheeler asked:
How will while behave?
Cwhile 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
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
implicit
David Wheeler asked:
while $fh {...}# Iterate until $fh.readline returns EOF?
That's a scalar context?
Sure. Cwhile always evaluates its condition in a scalar context.
Damian
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