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orElse()

orElse<E1, A, E2>(onLeft): (ma) => Either<E2, A>

Recovers from a Left by applying a function.

Type Parameters​

E1: E1​

The original error type.

A: A​

The success type.

E2: E2​

The new error type.

Parameters​

onLeft: (e) => Either<E2, A>​

Handler for Left case.

Returns​

A function that transforms the Either.

Since​

2.0.0