I guess there will be always different tastes regarding this subject :-)
sexta-feira, 5 de Abril de 2019 às 13:48:32 UTC+1, Andrea Leopardi escreveu:
>
> Often times matching on the tuple size can make your program safer since
> it will crash on unexpected inputs. In cases like the one you mentioned, I
> would go with |> Enum.map(fn {x, _, _} -> x end).
>
> On Fri, 5 Apr 2019 at 14:46, Mário Guimarães <mario.lui...@gmail.com
> <javascript:>> wrote:
>
>> Hi José
>>
>> there are occasions like when doing ... |> Enum.map(&first) |> ... where
>> pattern matching does not apply, and .. |> Enum.map(&elem(&1,0)) |> ... is
>> much less readable.
>>
>> It was regarding these cases that I thought about tuple accessors.
>>
>> Mário Guimarães
>>
>> sexta-feira, 5 de Abril de 2019 às 12:42:11 UTC+1, José Valim escreveu:
>>>
>>> But perhaps, the most important, is that generally you should be pattern
>>> matching on tuples.
>>>
>>> Most of the times, you know exactly the size of the tuple you are
>>> working with, and pattern matching on it is more intention revealing.
>>>
>>> If you have large tuples and the size may change, then sure, pattern
>>> matching is not a good idea, but then the Record module becomes handy.
>>> Record allows you to work with tuples and give also them names, and the
>>> names are a better API than relying on indexes.
>>>
>>> *José Valim*
>>> www.plataformatec.com.br
>>> Skype: jv.ptec
>>> Founder and Director of R&D
>>>
>>>
>>> On Fri, Apr 5, 2019 at 1:13 PM Arjan Scherpenisse <scherp...@gmail.com>
>>> wrote:
>>>
>> If you really want this, you could metaprogram it yourself ;-)
>>>>
>>>> defmodule TupleAccess do
>>>> @names ~w(first second third fourth fifth sixth seventh eight ninth
>>>> tenth)a
>>>>
>>>> for {name, index} <- Enum.with_index(@names) do
>>>> def unquote(name)(tuple) do
>>>> elem(tuple, unquote(index))
>>>> end
>>>> end
>>>> end
>>>>
>>>> iex(5)> import TupleAccess
>>>> TupleAccess
>>>> iex(6)> first({:a})
>>>> :a
>>>> iex(7)> first({:a, :b})
>>>> :a
>>>> iex(8)> second({:a, :b})
>>>> :b
>>>>
>>>>
>>>> On Friday, April 5, 2019 at 1:05:35 PM UTC+2, Louis Pilfold wrote:
>>>>>
>>>>> Hey
>>>>>
>>>>> We have elem/2, which is quite clear and more concise.
>>>>>
>>>>> We don't need specific functions for each index because we are not
>>>>> limited by a static type system and so the index does not need to be
>>>>> known
>>>>> at compile time.
>>>>>
>>>>> Cheers,
>>>>> Louis
>>>>>
>>>>> On Fri, 5 Apr 2019, 11:29 Mário Guimarães, <mario.lui...@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> any reason why there are no easy readable idioms like
>>>>>>
>>>>>> first, snd, third, ..., tenth (I guess is enough)
>>>>>>
>>>>>> to access tuples?
>>>>>>
>>>>>> Thanks
>>>>>>
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> --
>
> Andrea Leopardi
> an.le...@gmail.com <javascript:>
>
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