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Postings from October 2014
On 10/14/2014 10:06 AM, H.Merijn Brand wrote:
> On Tue, 14 Oct 2014 15:43:40 +0100, "Paul \"LeoNerd\" Evans"
> <leonerd@leonerd.org.uk> wrote:
>
>> On Tue, 14 Oct 2014 08:47:15 -0400
>> Ricardo Signes <perl.p5p@rjbs.manxome.org> wrote:
>>
>>> Also, we have LVALUE refs. Is this feature actually
>>> related to that?
>> The things we have that are called LVALUE are the lvalues returned by
>> the substr() function so that mutations of it can affect the original:
>>
>> my $str = "Hello world";
>> substr( $str, 0, 5 ) = "Goodbye"; <== assignment to an LVALUE
> is that (internally) different from using the 4-arg form (which I
> prefer because it is much faster)?
If you use the lvalue returned only once, no. But:
$ perl -E 'my $str = "Hello"; for(substr($str,1,1)) { say $_; $_="ee";
say $str; $_ = "aaa"; say $str }'
e
Heello
Haaallo
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