> Bryan R Harris wrote:
>
>>> perl -wle '
>>>
>>> sub inc{ ++$_ for @_ }
>>>
>>> my @x = 1 .. 5;
>>>
>>> inc @x;
>>>
>>> print "@x";
>>> '
>>> 2 3 4 5 6
>>
>>
>> FYI, the reason we wanted a reference was because the data set might end up
>> being huge.
>
> FYI, there is no issue.
Is this because the parameters are passed as aliases??? Wow, I had no
idea...
>> Uh, come to think of it, I'm surprised your script does what it does. I'd
>> have thought that the changes made internal to inc would've stayed there
>> since they're not being "returned". This bothers me a little...
>
> It shouldn't bother you, it should make you aware that parameters in
> Perl are aliases, so there is no content copying happening until you
> code it.
>
>
> perl -wle'
>
> my @x = 0 .. 3;
> print "@x";
>
> ++$_ for grep $_, @x;
> print "@x";
>
> ++$_ for map $_, @x;
> print "@x";
> '
(I'm not smart enough to understand what this code is supposed to be
teaching me.)
Thanks for the point above, though, I wish I'd known that years ago.
- Bryan
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