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| traverseX :: forall f. Functor f = (a -> f a) -> Vec3 a -> f (Vec3 a) | |
| traverseX f (Vec3 x y z) = (\h -> Vec3 h) <$> f x | |
| traverseY :: forall f. Functor f = (a -> f a) -> Vec3 a -> f (Vec3 a) | |
| traverseY f (Vec3 x y z) = (\h -> Vec3 h) <$> f x | |
| traverseZ :: forall f. Functor f = (a -> f a) -> Vec3 a -> f (Vec3 a) | |
| traverseZ f (Vec3 x y z) = (\h -> Vec3 h) <$> f x | |
| type Lens s a = forall f. Funtor f => (a -> f a) -> s -> f s | |
| _X :: Lens a (Vec3 a) | |
| _X = traverseX | |
| _Y :: Lens a (Vec3 a) | |
| _Y = traverseY | |
| _Z :: Lens a (Vec3 a) | |
| _Z = traverseZ | |
| -- > over _X (+1) (Vec3 1 0 7) | |
| -- this is just for visual prettification, its just "flipped application" | |
| (&) = flip ($) | |
| (%~) = over | |
| -- We can use it like this | |
| -- > (Vec3 1 0 7) & _X %~ (+1) |
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