On Sat, Aug 5, 2017 at 2:50 AM, Sean McAfee <eef...@gmail.com> wrote:
> On Fri, Aug 4, 2017 at 10:18 PM, ToddAndMargo <toddandma...@zoho.com>
> wrote:
>
>> On 08/04/2017 08:43 PM, Bruce Gray wrote:
>>
>>>
>>> P6-ish version:
>>> ifconfig | perl6 -e 'say lines.map({ ~$0 if /^(\S+) ": flags="/
>>> }).sort[1]'
>>>
>>
>>
> Wait a second. How does map skip input elements like that?
>
> > map { $_ if $_ %% 2 }, 1..10
> (2 4 6 8 10)
>
> > 1 if 1 %% 2
> ()
>
> But:
>
> > map { $_ %% 2 ?? $_ !! () }, 1..10
> (() 2 () 4 () 6 () 8 () 10)
>
Perl 5 doesn't do nested lists (unless you use arrayrefs) so () flattens
away. In Perl 6, to get a similar effect you produce Nil. As Nil is the
default value in that first block, it gets produced if the condition fails.
--
brandon s allbery kf8nh sine nomine associates
allber...@gmail.com ballb...@sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
