wnoise at ofb.net
Sat Apr 8 14:22:08 EDT 2006
On 2006-04-08, Nils Anders Danielsson <nad at cs.chalmers.se> wrote:
> On Fri, 07 Apr 2006, "Spencer Janssen" <spencerjanssen at gmail.com> wrote:
>>> inits xs =  : (zipWith take [1..] $ map (const xs) xs)
>> As this version performs much better and will work as a drop in
>> replacement, I suggest that it be included in the hierarchical
> It is not a drop in replacement. The original inits is strict, this
> one isn't.
> The specification of inits (from the Haskell 98 report):
> inits :: [a] -> [[a]]
> inits  = []
> inits (x:xs) = [] ++ map (x:) (inits xs)
Is that a property many programs depend on? I'd actually call that a
bug of the original.
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