Re: [Haskell-cafe] Rewrite without parenthesis

On 18 August 2016 at 22:29, Theodore Lief Gannon wrote:

Francesco, you missed a piece. 'head' is part of the expression. :) What Carl is looking for is one or the other of these:

head $ tail [1,2,3] -- or -- head . tail $ [1,2,3]

Or for this specific use case, [1,2,3] !! 1 ==> (!!1) [1,2,3]

The first one is shorter and fine for inlining, but I generally prefer the second form... it helps intuition about eta reduction, refactoring, and additional composition.

On Aug 18, 2016 5:19 AM, "Francesco Ariis" wrote:

...

On Thu, Aug 18, 2016 at 05:03:21AM -0700, Carl Petersen wrote:

...

How do you rewrite head (tail [1,2,3]) without parenthesis.

Hello Carl, simply

λ> tail [1,2,3] [2,3]

will do! Haskell is not a Lisp, no need to wrap expressions around (). _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.

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