Natural Transformation Examples (3/4)
-------------------------------------

<pre><code class="haskell small">toMaybe :: [a] -> Maybe a
toMaybe [] = Nothing
toMaybe (x:xs) = Just x</pre></code>


`toMaybe` is a natural transformation.
It is also a morphism from `[]` to `Maybe` in the Category of \\(\\Hask\\) endofunctors.

<img style="float:left;width:30%" src="categories/img/mp/nattrans-list-maybe.png" alt="natural transformation commutative diagram"/>
<figure style="float:right;width:60%">
<img style="width:40%" src="categories/img/mp/list-maybe-endofunctor-morphism.png" alt="natural transformation commutative diagram"/>
</figure>