andThen

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

Defined in: Core/Optional.ts:190

Composes two Optionals: focuses through the outer, then through the inner. Returns None if either focus is absent.

Type Parameters

A

A

B

B

Parameters

inner

Optional<A, B>

Returns

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

Type Parameters

S

S

Parameters

outer

Optional<S, A>

Returns

Optional<S, B>

Example

const deepOpt = pipe(
  Optional.prop<User>()("address"),
  Optional.andThen(Optional.prop<Address>()("landmark")),
);