I think of & as those in that order of preference:
&<identifier>/<integer> - local function reference
&<simple-expression> - lambda definition
where <simple-expression> : <function-call> | <literal> | (<complex-expression>)
So
&1 = fn -> 1 end
&num/2 = fn a, b -> num(a, b) end
And of course we don't need even the existing syntax as "this would be done to
save just a handful of characters".
On 15 February 2019 22:10:04 GMT+11:00, "José Valim"
<jose.va...@plataformatec.com.br> wrote:
>Furthermore there are intrinsic ambiguities:
>
>For example:
>
>&1
>
>
>Is that a function that returns 1 or is it a user error which forgot
>the
>outermost &?
>
>And this example:
>
>&num/2
>
>
>Is that num divided by 2 or an attempt to capture the num function of
>arity
>2?
>
>So the reason why the capture operator requires at least one
>(consecutive)
>argument is to make the code clearer. And sure, the compiler could
>solve
>those, but the ambiguity will always be there for users reading the
>code.
>
>*José Valim*
>www.plataformatec.com.br
>Skype: jv.ptec
>Founder and Director of R&D
>
>
>On Fri, Feb 15, 2019 at 12:05 PM Andrea Leopardi
><an.leopa...@gmail.com>
>wrote:
>
>> Hey Mario,
>>
>> The capture operator today already has a few forms (arity or
>arguments)
>> and I think it would be better to keep it simple and not add more
>specific
>> behaviors, especially considering this would be done to save just a
>handful
>> of characters.
>>
>> Andrea
>>
>> On Fri, 15 Feb 2019 at 11:56, Mário Guimarães <
>> mario.luis.guimar...@gmail.com> wrote:
>>
>>> Where is
>>>
>>> fn () -> M.fun("value")
>>>
>>> it should be
>>>
>>> fn () -> M.fun("value") end
>>>
>>> or
>>>
>>> fn -> M.fun("value") end
>>>
>>>
>>>
>>> quinta-feira, 14 de Fevereiro de 2019 às 16:46:18 UTC, Mário
>Guimarães
>>> escreveu:
>>>>
>>>> Hello,
>>>>
>>>> Elixir could support function captures without the need for any
>>>> argument, so that of instead of writing
>>>>
>>>> fn () -> M.fun("value")
>>>>
>>>> end one could write
>>>>
>>>>
>>>> &M.fun("value")
>>>>
>>>> Today the later returns an error like
>>>>
>>>> ** (CompileError) iex:28: invalid args for &, expected an
>expression in
>>>> the format of &Mod.fun/arity, &local/arity or a capture containing
>at
>>>> least one argument as &1, got: M.fun("value"))
>>>>
>>>> Thanks
>>>> Mário
>>>>
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>>
>> Andrea Leopardi
>> an.leopa...@gmail.com
>>
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Kind regards,
Dmitry Belyaev
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