idiom for producing comma-seperated lists?

[D. Tweed]

On Fri, 8 Aug 2003, Antony Courtney wrote:

> I often need to format a list of strings using some character as a 
> *seperator* rather than a terminator for the items.  Is there some 
> simple combinator or idiom from the Prelude or standard libraries that 
> could be used for this purpose?

I think the primary intended use for `intersperse' from the List library
is to be used as in

import List

mkSepStr = concat . intersperse ", "

HTH,

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