2 ms·

It seems like there should be a way to define player1 as its own (root) lens so that one is simply writing player1.location.x .~ (+10), or so. Are we simply not

• tel 13y ago
  That can kind of be done using `Context`s, but those are really just implementation details and should rarely be used. Broadly, you wouldn't want to do that because it implies mutation. There's not much value in `player1.location.x %~ (+10)` because it can't modify player1... just return a modified (player1'new). Of course, stateful mutation is just a monadic effect, so you can wrap it up into a State monad, which Lens already has shortcuts for do location.x += 10 location.y += 10 which has type like `MonadState ThingWithLocation m => m ()` and we can then apply it to whatever `player` we want as a pure function.