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

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