cchalmers questions

cchalmers answers

• What is `Cons` in Data.FixedList source code?
• How to "compose" Iso's?
• How to take an 2D slice with Lens
• How would I use lens in Haskell to duplicate Python's enumerate?
• How to use lenses to look up a value in a map, increase it or set it to a default value
• Do GHC REWRITE pragmas have to be type preserving?
• stepping into zipper with `to` lens
• Just when are unsafeVacuous, #., and .# unsafe?
• Is there a generic function that takes a data structure and returns all ints in it?
• Can't find inerface-file declaration for variable