[Haskell-cafe] Function application like a Unix pipe

Tomasz Zielonka tomasz.zielonka at gmail.com
Wed Nov 23 06:41:24 EST 2005

On Wed, Nov 23, 2005 at 11:17:25AM +0100, Udo Stenzel wrote:
> infixl 2 \|
> (\|)  = flip (.) -- though I'm using (&)
> The unix pipe becomes (filter ("foo" `isPrefixOf`) \| sort \| nub) or
> something, which is rather neat, and (#) is used to call "member
> functions", as in

Why not use Control.Arrow.>>> ?
The instance for (->) is exactly what you want, and the syntax is quite

    (filter ("foo" `isPrefixOf`) >>> sort >>> nub)

BTW, using sort before nub is a bit pointless. In fact, using nub for
longer lists is a bad idea.

Best regards

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