On Mon, Feb 8, 2016 at 6:48 PM, Bram Moolenaar <[email protected]> wrote:
>
> [adjusted the subject, it was "Why is v:none needed"]
>
> Takuya Fujiwara wrote:
>
>> > [...]
>> >
>> > > >> let json = jsonencode({"key": v:none})
>> > > >> if json is v:none
>> > > >> echoerr 'error!'
>> > > >> return ...
>> > > >> endif
>> > > >
>> > > > Well, let's just return an empty string. Returning a different type
>> > > > often makes it more complicated.
>> > >
>> > > I agree.
>> > > However, I think "E706: Variable type mismatch" should be removed
>> > > becase it is not so useful for me...
>> >
>> > Where do you get that? Or do you mean that the sticky type checking
>> > isn't all that useful in general? I've been wondering whether we would
>> > be better off without it.
>>
>> I don't think it is useful in lightweight languages
>> (I don't think *only* a strict type checking is useful).
>> A strict type checking is useful for a language which has a strong type
>> system.
>> Because we can detect errors by different types, and so on.
>
> At the time it seemed like a good idea, to have some type checking to
> avoid mistakes. Over time I can't say this has uncovered a problem. I
> did run into the error when I didn't want it. Currently I think we
> might be better off without it.
>
> So, let's ask: who finds the sticky type checking useful?
+1.
I'll show a example here, why we might be better off a sticky type checking.
for i in ['foo', 'bar', {'key': 'baz'}]
echo string(i)
endfor
Will output:
'foo'
'bar'
E706: Variable type mismatch for: i
We need 'unlet i'.
It is easy to miss it...
for i in ['foo', 'bar', {'key': 'baz'}]
echo string(i)
" If you :continue here, you need to :unlet in the condition, too...
if ...
unlet i
continue
endif
" We need this always!
unlet i
endfor
>
> --
> hundred-and-one symptoms of being an internet addict:
> 178. You look for an icon to double-click to open your bedroom window.
>
> /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
> /// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
> \\\ an exciting new programming language -- http://www.Zimbu.org ///
> \\\ help me help AIDS victims -- http://ICCF-Holland.org ///
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