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mapLeft()

mapLeft<E, G>(f): <A>(fa) => Either<G, A>

Maps a function over the Left value of an Either.

Type Parameters​

E: E​

The original error type.

G: G​

The new error type.

Parameters​

f: (e) => G​

The mapping function.

Returns: <A>(fa): Either<G, A>​

A function that transforms the Either.

Since​

2.0.0