record

Documentation

Index

• func AtKey[S any, K comparable, V any](key K) func(sa L.Lens[S, map[K]V]) L.Lens[S, O.Option[V]]
• func AtRecord[K comparable, V any](key K) L.Lens[map[K]V, O.Option[V]]

Functions

func AtKey

func AtKey[S any, K comparable, V any](key K) func(sa L.Lens[S, map[K]V]) L.Lens[S, O.Option[V]]

AtKey returns a `Lens` focused on a required key of a `ReadonlyRecord`

func AtRecord

func AtRecord[K comparable, V any](key K) L.Lens[map[K]V, O.Option[V]]

AtRecord returns a lens that focusses on a value in a record