Re: map* for Data.List

On 11/4/06, Taral wrote:

On 11/4/06, Bulat Ziganshin wrote:

...

Hello libraries,

similar to mapFst and Co, we can define:

-- |Map various parts of list

I don't think this is really that useful. Lists are homogeneous, tuples are heterogeneous.

Hmm, from the first two lines, I was expecting mapHead :: (a -> a) -> [a] -> [a] as given by Bulat, but also mapTail :: ([a] -> [a]) -> [a] -> [a] instead of mapTail :: (a -> a) -> [a] -> [a] I wasn't expecting the other two at all, but I would have expected mapInit to have a similar type to mapTail. (But really, I wouldn't have wanted those. Not that I'm sure I'd want either of the first two.)