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flatMapOption()

flatMapOption<A, B, E2>(f, onNone): <E1>(self) => Either<E2 | E1, B>

FlatMaps over an Option result.

Type Parameters​

A: A​

The input type.

B: B​

The output type.

E2: E2​

The error type for None.

Parameters​

f: (a) => object​

The mapping function.

onNone: (a) => E2​

Function to create error for None.

Returns: <E1>(self): Either<E2 | E1, B>​

A function that flatMaps the Either.

Since​

2.0.0