You have an extra semicolon in there -" say $x; for" -
so what happens is for each line
1. it runs "say $x" and thus prints "Line 0" the first time through, since
it had read "Line 0" only
2. Then it runs "say $i" for each of $x.lines()[3,2,5] - but $x is only
"Line 0" so it says 3 x "Nil"
3. Repeat for "Line 1", etc
-y
On Thu, Aug 27, 2020 at 1:40 PM ToddAndMargo via perl6-users <
perl6-us...@perl.org> wrote:
> On 2020-08-27 13:28, Tobias Boege wrote:
> > On Thu, 27 Aug 2020, ToddAndMargo via perl6-users wrote:
> >> To pick out particular lines:
> >> $ cat Lines.txt | raku -e '.say for lines()[3,2,5]'
> >> Line 3
> >> Line 2
> >> Line 5
> >>
> >> If it is, it is buried somewhere.
> >>
> >> And what goes inside the ()? That may seem like a dumb
> >> remark (especially since I live and die in Top Down and
> >> know very well what the () does) but it is a common mistake
> >> I make with lines is forgetting the () when using the [].
> >>
> >
> > How does that mistake manifest? I cannot see a way in which omitting
> > the sub call parentheses in code like that could possibly lead to some
> > different behavior.
> >
>
> Here is does not:
>
> $ cat Lines.txt | raku -e '.say for lines[3,2,5]'
> Line 3
> Line 2
> Line 5
>
> And I am having trouble reproducing the issue. Would
> help my point, no? I will write back if I find it.
> Usually I forget my mistakes as soon as I figure out
> the right way to do things.
>
> Now this is getting weird!
>
> $ cat Lines.txt | raku -ne 'my $x=$_; say $x; for $x.lines()[3,2,5] ->
> $i {say $i;}'
>
> Line 0
> Nil
> Nil
> Nil
> Line 1
> Nil
> Nil
> Nil
> Line 2
> ...
>
