andThenOptional

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

Defined in: Core/Lens.ts:123

Composes a Lens with an Optional, producing an Optional. Use when the next step in the focus is optional (may be absent).

Type Parameters

A

A

B

B

Parameters

inner

Optional<A, B>

Returns

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

Type Parameters

S

S

Parameters

outer

Lens<S, A>

Returns

Optional<S, B>

Example

const userBioOpt = pipe(
  Lens.prop<User>()("profile"),
  Lens.andThenOptional(Optional.prop<Profile>()("bio")),
);