Function optionalLens

Creates a lens for optional properties that may be missing or null.

optionalLens<T, U>(getter, setter): OptionalLens<T, U>
Type Parameters
- T
  The parent object type.
- U
  The property type.
Parameters
- getter: ((obj: T) => U)
  Function to get the property or return null.
  - - (obj): U
    - Parameters
      obj: T
      Returns U
- setter: ((value: U, obj: T) => T)
  Function to set the property immutably.
  - - (value, obj): T
    - Parameters
      value: U
      obj: T
      Returns T
Returns OptionalLens<T, U>
- Defined in functional/lens/Lens.ts:79