ZyX wrote:
> пятница, 31 мая 2013 г., 17:14:17 UTC+4 пользователь mattn написал:
> > Hi all.
> >
> > filter() or map() is given {string} expression to compare the items. But
> > sort() is given function name or funcref for that.
> > I hope to give expression to {func}.
> >
> > I guess this is useful to call sort().
> >
> > :echo sort([{"foo":3},{"foo":2},{"foo":4}], "v:lhs.foo - v:rhs.foo")
> > [{'foo': 2}, {'foo': 3}, {'foo': 4}]
> >
> > Below is a patch. Please check and include.
> > This patch still allow to give string for function name.
> >
> > https://gist.github.com/mattn/5684747
> >
> > Thanks.
> > - Yasuhiro Matsumoto
>
> I would prefer a patch for adding support for funcrefs in map/filter instead.
>
> And it is also bad idea to only overload strings: if you need
> expressions here use special value (like "expr") in place of {dict},
> add second optional argument or whatever, but **do not silently allow
> invalid function names taking them as expression**. There already is a
> lot of places where vim shows strange behavior with otherwise invalid
> input, don't add yet another one.
Using strings here was just a quick way of making it work. What we
would really need is some kind of lambda function. So the argument
would be one of three types:
expression - mainly for backwards compatibility, but also allows
building the functionality from pieces.
function name or reference - for bigger functions
lamba function - for small functions
That could be used in several places.
Implementing a lambda function is not trivial though.
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/// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
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