[Haskell-cafe] exists . a psuedo-standard non-empty list module

[Alfonso Acosta]

Hi Nick,

On 2/16/07, Nicolas Frisby <nicolas.frisby at gmail.com> wrote:
> I don't particularly like using fromJust or head, and there's been

IMHO I think that isJust/fromJust could simply be removed. Using
'maybe' is a much better practice, it is safe and much even more
expressive.

head on the other hand might be considered more necessary but right
now I cannot think of a situation in which it's use shows any
advantage over simple pattern matching.

It's anyway worth to check Neil's Safe library
http://www-users.cs.york.ac.uk/~ndm/projects/safe/Safe.html