proposal for trailing comma and semicolon

[Greg Weber]

I think Tilmann's way is the right way (because it is very clear when a
comma is missing since they align, unlike trailing commas), although the
original proposal is the popular way. I would rather get rid of commas
altogether (make them optional actually) and just have a newline +
consistent indentation signal a new list item: coffee-script does that.


On Fri, May 17, 2013 at 11:23 AM, Tillmann Rendel <
rendel at informatik.uni-marburg.de> wrote:

> Hi,
>
> Garrett Mitchener wrote:
>
>> There's a weird idiom that I see all the time in Haskell code where
>> coders put commas at the beginning of lines:
>>
>> data Thing = Thing {
>>    x :: Int
>>    ,y :: Int
>>    ,z :: Int
>>    ,foo :: String
>> } ...
>>
>> items = [
>>    "red"
>>    ,"blue"
>>    ,"green"
>> ]
>>
>
> (I don't think this is valid Haskell. The closing } and ] should be more
> indented).
>
> I like to put commas at the beginning of lines, because there, I can make
> them line up and it is visually clear that they are all at the same nesting
> level. I like how the commas look a bit like bullet points. For example, I
> would write:
>
> items =
>   [ "red"
>   , "blue"
>   , "green"
>   ]
>
> Could we extend Garett's proposal to also allow prefixing the first
> element of a list with a comma, to support this style:
>
> items = [
>   , "red"
>   , "blue"
>   , "green"
>   ]
>
> Allowing an optional extra comma both at the beginning and at the end
> would allow programmers the choice where they want to put their commas.
>
>   Tillmann
>
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