[GHC] #971: Add intercalate and split to Data.List

[GHC]

#971: Add intercalate and split to Data.List
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    Reporter:  josef     |       Owner:         
        Type:  proposal  |      Status:  new    
    Priority:  normal    |   Milestone:         
   Component:  Compiler  |     Version:  6.6    
    Severity:  normal    |    Keywords:         
  Difficulty:  Unknown   |    Testcase:         
Architecture:  Unknown   |          Os:  Unknown
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Add a function equal to `concat (intersperse x xs)`

 The initial mail for this proposal and the following discussion can be
 found here:
 http://www.haskell.org/pipermail/libraries/2006-October/005917.html

 A summary of the discussion:

 = Accepting the patch =
 A lot of people agreed that including a function such as intercalate in
 the libraries would be a good thing. Indeed, many said they already had
 such a function in their own libraries.
 Jon Fairbairn argued against giving a name to such a short idiom and this
 was supported by Ketil Malde.

 The submitter interpreted this as a clear majority in favour of this
 patch.

 = The name 'intercalate' =
 The original proposal for the name was join. Since it clashes with
 Control.Monad.join it was deemed inappropriate. Many other names were
 suggested:    separateWith, sepBy, joinWith, concatIntersperse, consperse,
 intercat, connect, concatInter and intercalate. The original submitter
 decided for 'intercalate'. A number people said they agreed with this. One
 person said he preferred joinWith but others argued against that. Some
 people expressed their concerns against such an uncommon word being used
 and suggested that there should be some explanation for it.  It was agreed
 that there should be an explanation somewhere on the Wiki.

 = Split =
 Bulat Ziganshin suggested also adding a function split which is a right
 inverse of intercalate. Donald Steward seemed to agree with this decision.
 No one else raised their voice about this so it seems uncontroversial.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/971>
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