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@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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