[Haskell-cafe] map (-2) [1..5]

[David House]

On 17/08/06, Tamas K Papp <tpapp at princeton.edu> wrote:
> The code in the subject generates an error.  I understand why this is
> (- is treated as part of the number), but I don't know how to solve
> it, ie how to tell Haskell that - is a function/binary operator?

There's a Prelude function for exactly this purpose, which leads your
code still quite readable:

Prelude> map (subtract 2) [1..5]
[-1,0,1,2,3]

-- 
-David House, dmhouse at gmail.com