On 12/31/20 1:56 PM, Brad Gilbert wrote:
It does not look like an array from 0 to ($nCount - 1). It only iterates
like that.
It is a Range object from 0 to $nCount excluding $nCount.
^9 === Range.new( 0, 9, :excludes-max ) # True
0 ~~ ^9 # True
1 ~~ ^9 # True
0.5 ~~ ^9 # True
8 ~~ ^9 # True
8.99999 ~~ ^9 # True
9 ~~ ^9 # False
In the case of `for ^9 {…}` it iterates starting at 0, and continuing to
just before 9.
It does that because `for` iterates the Range object.
It does NOT store any values other than the min, max and either excludes.
An array would store the values in the middle. Which would be a waste of
memory.
Which is why it does not do that.
On Wed, Dec 30, 2020 at 8:09 PM ToddAndMargo via perl6-users
<perl6-us...@perl.org <mailto:perl6-us...@perl.org>> wrote:
On 12/30/20 5:39 PM, ToddAndMargo via perl6-users wrote:
> Hi All,
>
> In the following for loop:
>
> for ^$nCount -> $i {
>
> What is the ^ doing?
>
> Confused again,
> -T
Used in context, the ^ makes the integer $nCount look
like an array of 0 to ($nCount - 1). Am I missing
something?
my $x=4;
for ^$x -> $i { print "i = $i\n"; }
i = 0
i = 1
i = 2
i = 3
Thank you!
