andThenLens

andThenLens<A, B>(inner): <S>(outer) => Optional<S, B>

Defined in: Core/Optional.ts:215

Composes an Optional with a Lens, producing an Optional. The Lens focuses within the value found by the Optional.

Type Parameters

A

A

B

B

Parameters

inner

Lens<A, B>

Returns

<S>(outer): Optional<S, B>

Type Parameters

S

S

Parameters

outer

Optional<S, A>

Returns

Optional<S, B>

Example

const cityOpt = pipe(
  Optional.prop<User>()("address"),
  Optional.andThenLens(Lens.prop<Address>()("city")),
);