UnsafeOptics

Decode a value at the current location.

Note that this operation is not lawful, since decoding is not injective (as noted by Julien Truffaut). It is provided here for convenience, but may change in future versions.

Select if a value matches a predicate

Note that this operation is not lawful because the predicate could be invalidated with set or modify. However select(_.a > 10) composeLens b is safe because once we zoom into b, we cannot change a anymore.

Decode a value at the current location. But give Option[A] instead of A in order to treat non-exist field as None

Note that this operation is not lawful, since the same reason as above It is provided here for convenience, but may change in future versions.