Index - B
| backwards | Optics.Traversal, Optics.Core |
| backwards_ | Optics.Fold, Optics.Core |
| base | Numeric.Optics |
| below | Optics.Prism, Optics.Core |
| Bicontravariant | Optics.Internal.Bi |
| Bifunctor | Optics.Internal.Bi |
| bimap | Optics.Internal.Bi |
| binary | Numeric.Optics |
| both | Optics.Traversal, Optics.Core |
| branches | Data.Tree.Optics |