27 Jan
2015
27 Jan
'15
6:12 a.m.
| 1. What are the IV instances provided in base? These could give | selector functions, lenses, both or neither. My instinct: just selector functions. Leave lenses for a lens package. I still have not understood the argument for lenses being a function rather that a newtype wrapping that function; apart from the (valuable) ability to re-use ordinary (.), which is cute. Edward has explained this several time, but I have failed to understand. Simon