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Postings from June 2022
On Tue, Jun 14, 2022 at 7:10 PM Tom Molesworth <tom@deriv.com> wrote:
> On Wed, 15 Jun 2022 at 00:13, Graham Knop <haarg@haarg.org> wrote:
>
>> On Tue, Jun 14, 2022 at 6:02 PM Alexander Hartmaier
>> <alex.hartmaier@gmail.com> wrote:
>> >
>> > On Tue, Jun 14, 2022 at 11:33 AM Graham Knop <haarg@haarg.org> wrote:
>> >>
>> >> On Tue, Jun 14, 2022 at 8:15 AM Alexander Hartmaier
>> >> <alex.hartmaier@gmail.com> wrote:
>> >> > Look at some of the other modules using the return value of require
>> from the grep.metacpan.org link.
>> >>
>> >> Do you have a concrete example?
>>
>
> There are plenty of cases which are effectively "`require` is used instead
> of `do`", i.e. calling `require` and the subsequent code relies on the
> data, rather than truth of the return value.
>
> Some examples from just the first page of results - there are others on
> that page:
>
> https://grep.metacpan.org/search?qci=&q=%3D%20require&qft=&qd=AWS-Lambda
>
> my $app = require "$ENV{'LAMBDA_TASK_ROOT'}/app.psgi";
> my $func = AWS::Lambda::PSGI->wrap($app);
>
> https://grep.metacpan.org/search?qci=&q=%3D%20require&qft=&qd=App-Alice
>
> my $config = {};
> if (-e $self->fullpath) {
> $config = require $self->fullpath;
>
> https://grep.metacpan.org/search?qci=&q=%3D%20require&qft=&qd=App-Chart
>
> my $aref = require App::Chart::Gtk2::IndicatorModelGenerated;
>
> All of these are somewhat fragile: call the code twice or have something
> else `require` the relevant module/file first, and they'd have problems.
> However, given how often this pattern appears,
> require-returns-`builtin::true` may be too disruptive if strictly enforced?
>
> Keeping the original value _also_ doesn't seem like a good idea, `package
> Example; my $should_drop_out_of_scope = ...;` for example.
>
> I saw those but they confused me.
So require just returns what the loaded file returns? So in case the file
ends in 1;, the return value is 1, but some return a blessed object and
this is returned?
Is that a feature or a misuse of 'require'?
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