Re: [Haskell-cafe] Is this a useful higher-order function, or should I RTFM?

[Steven Huwig]

On Dec 6, 2004, at 11:05 PM, Tom Pledger wrote:
   import Data.Char(isSpace)
   import Data.List(groupBy)
   (op `on` f) x y = f x `op` f y
   wordsAndSpaces  = groupBy ((==) `on` isSpace)
`on` is a handy little function in this instance.
Does it have a technical name?
Have you used it elsewhere?
-- Steve
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