Inline:
> ---------- Forwarded message ---------
> From: Simon Proctor <simon.proc...@gmail.com>
> Date: Sat, Nov 23, 2019 at 3:34 AM
> Subject: Re: for by 3?
> To: ToddAndMargo <toddandma...@zoho.com>
> Cc: perl6-users <perl6-us...@perl.org>
>
> If you want to read you lines in groups of 3 then you want batch :
> for @x.lines.batch(3) -> @b
> If you just want the third line and throw away the first I'd probably do a
> tail on that.
> for @x.lines.batch(3).map( *.tail ) -> $l
> Note you need to map the tail on each batch of three not slap it on the
> end.
Hi Simon, can you explain to me what the "->" arrow is doing in your above?
All I see in the docs is "->" used within the signature part of a sub. I
can get some "->" arrow-containing code to work (below), but it doesn't
resemble your code. Specifically, if I drop the block containing 'put',
Raku/Perl6 throws an error. Any advice appreciated, Bill.
mbook:~ homedir$ cat testcode5.p6
first line of code
second line of code
third line of code
fourth line of code
fifth line of code
mbook:~ homedir$ cat testcode5.p6 | perl6 -e 'my @b; for lines.batch(3) ->
@b {put @b};'
first line of code second line of code third line of code
fourth line of code fifth line of code
mbook:~ homedir$ cat testcode5.p6 | perl6 -e 'my @b; for lines.rotor(3) ->
@b {put @b};'
first line of code second line of code third line of code
mbook:~ homedir$ cat testcode5.p6 | perl6 -e 'my $b; for lines.batch(3) ->
$b {put $b};'
first line of code second line of code third line of code
fourth line of code fifth line of code
mbook:~ homedir$ cat testcode5.p6 | perl6 -e 'my $b; for lines.batch(3) ->
$b;'
===SORRY!=== Error while compiling -e
Malformed parameter
at -e:1
------> my $b; for lines.batch(3) -> $b;⏏<EOL>
mbook:~ homedir$
