- declaring a class inside a function allows me put related code together
- can be used to simulate a closure function.
example for java:
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AsyncTaskRunner runner = new AsyncTaskRunner();
String sleepTime = time.getText().toString();
runner.execute(sleepTime);
}
});
and python:
def subscript(event_list):
class MyListener(EventListener):
def __init__ (self, id):
self.id = id
def on_enter (self):
# do something
return -1
def on_leave (self):
# done
for event in event_list:
x = MyListener(event)
scheduler.add_listener(x)
在2023年1月13日星期五 UTC+8 04:05:46<Bram Moolenaar> 写道：
>
> > One more thing about vim9 class:
> >
> > can we define a named or anonymous class inside a function ?
> > That can be used to simulate a closure,
>
> It can be made possible, but the usefulness might be minimal. Perhaps
> you can give an example (possibliy in another language) of what you want
> to do.
>
> The idea of class support is to just implement the basics, what most
> other languages also have. Not adding all kinds of "nice to have"
> features.
>
> > And maybe, someday, we can translate javascript or lua to vim9script
> with
> > this feature.
>
> Javascript is a bit of a weird language, it will be very hard to
> translate into another language, because it has some constructs that
> most other languages don't have.
>
> Anyway, I don't see this as a goal.
>
> --
> I think that you'll agree that engineers are very effective in their social
> interactions. It's the "normal" people who are nuts.
> (Scott Adams - The Dilbert principle)
>
> /// Bram Moolenaar -- br...@moolenaar.net -- http://www.Moolenaar.net \\\
> /// \\\
> \\\ sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ ///
> \\\ help me help AIDS victims -- http://ICCF-Holland.org ///
>
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